Include MTU and SSH auth/JWT cache config in debug bundle

.golangci.yaml

@@ -58,6 +58,11 @@ linters:
     govet:
       enable:
         - nilness
+      disable:
+        # The inline analyzer flags x/exp/maps Clone/Clear with //go:fix inline
+        # directives but cannot perform the rewrite due to generic type
+        # parameter inference limitations in the Go inliner.
+        - inline
       enable-all: false
     revive:
       rules:

client/cmd/login.go

@@ -10,6 +10,7 @@ import (
 
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
+	"golang.org/x/term"
 	"google.golang.org/grpc/codes"
 	gstatus "google.golang.org/grpc/status"
 
@@ -23,6 +24,7 @@ import (
 
 func init() {
 	loginCmd.PersistentFlags().BoolVar(&noBrowser, noBrowserFlag, false, noBrowserDesc)
+	loginCmd.PersistentFlags().BoolVar(&showQR, showQRFlag, false, showQRDesc)
 	loginCmd.PersistentFlags().StringVar(&profileName, profileNameFlag, "", profileNameDesc)
 	loginCmd.PersistentFlags().StringVarP(&configPath, "config", "c", "", "(DEPRECATED) Netbird config file location")
 }
@@ -256,7 +258,7 @@ func doForegroundLogin(ctx context.Context, cmd *cobra.Command, setupKey string,
 }
 
 func handleSSOLogin(ctx context.Context, cmd *cobra.Command, loginResp *proto.LoginResponse, client proto.DaemonServiceClient, pm *profilemanager.ProfileManager) error {
-	openURL(cmd, loginResp.VerificationURIComplete, loginResp.UserCode, noBrowser)
+	openURL(cmd, loginResp.VerificationURIComplete, loginResp.UserCode, noBrowser, showQR)
 
 	resp, err := client.WaitSSOLogin(ctx, &proto.WaitSSOLoginRequest{UserCode: loginResp.UserCode, Hostname: hostName})
 	if err != nil {
@@ -324,7 +326,7 @@ func foregroundGetTokenInfo(ctx context.Context, cmd *cobra.Command, config *pro
 		return nil, fmt.Errorf("getting a request OAuth flow info failed: %v", err)
 	}
 
-	openURL(cmd, flowInfo.VerificationURIComplete, flowInfo.UserCode, noBrowser)
+	openURL(cmd, flowInfo.VerificationURIComplete, flowInfo.UserCode, noBrowser, showQR)
 
 	tokenInfo, err := oAuthFlow.WaitToken(context.TODO(), flowInfo)
 	if err != nil {
@@ -334,7 +336,7 @@ func foregroundGetTokenInfo(ctx context.Context, cmd *cobra.Command, config *pro
 	return &tokenInfo, nil
 }
 
-func openURL(cmd *cobra.Command, verificationURIComplete, userCode string, noBrowser bool) {
+func openURL(cmd *cobra.Command, verificationURIComplete, userCode string, noBrowser, showQR bool) {
 	var codeMsg string
 	if userCode != "" && !strings.Contains(verificationURIComplete, userCode) {
 		codeMsg = fmt.Sprintf("and enter the code %s to authenticate.", userCode)
@@ -348,6 +350,12 @@ func openURL(cmd *cobra.Command, verificationURIComplete, userCode string, noBro
 			verificationURIComplete + " " + codeMsg)
 	}
 
+	if showQR {
+		if f, ok := cmd.OutOrStdout().(*os.File); ok && term.IsTerminal(int(f.Fd())) {
+			printQRCode(f, verificationURIComplete)
+		}
+	}
+
 	cmd.Println("")
 
 	if !noBrowser {

client/cmd/qr.go

@@ -0,0 +1,25 @@
+package cmd
+
+import (
+	"io"
+
+	"github.com/mdp/qrterminal/v3"
+)
+
+// printQRCode prints a QR code for the given URL to the writer.
+// Called only when the user explicitly requests QR output via --qr.
+func printQRCode(w io.Writer, url string) {
+	if url == "" {
+		return
+	}
+	qrterminal.GenerateWithConfig(url, qrterminal.Config{
+		Level:          qrterminal.M,
+		Writer:         w,
+		HalfBlocks:     true,
+		BlackChar:      qrterminal.BLACK_BLACK,
+		WhiteChar:      qrterminal.WHITE_WHITE,
+		BlackWhiteChar: qrterminal.BLACK_WHITE,
+		WhiteBlackChar: qrterminal.WHITE_BLACK,
+		QuietZone:      qrterminal.QUIET_ZONE,
+	})
+}

client/cmd/qr_test.go

@@ -0,0 +1,26 @@
+package cmd
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestPrintQRCode_EmptyURL(t *testing.T) {
+	var buf bytes.Buffer
+
+	printQRCode(&buf, "")
+
+	if buf.Len() != 0 {
+		t.Error("expected no output for empty URL")
+	}
+}
+
+func TestPrintQRCode_WritesOutput(t *testing.T) {
+	var buf bytes.Buffer
+
+	printQRCode(&buf, "https://example.com/auth")
+
+	if buf.Len() == 0 {
+		t.Error("expected QR code output for non-empty URL")
+	}
+}

client/cmd/up.go

@@ -39,6 +39,9 @@ const (
 	noBrowserFlag = "no-browser"
 	noBrowserDesc = "do not open the browser for SSO login"
 
+	showQRFlag = "qr"
+	showQRDesc = "show QR code for the SSO login URL (useful for headless machines without browser access)"
+
 	profileNameFlag = "profile"
 	profileNameDesc = "profile name to use for the login. If not specified, the last used profile will be used."
 )
@@ -48,6 +51,7 @@ var (
 	dnsLabels          []string
 	dnsLabelsValidated domain.List
 	noBrowser          bool
+	showQR             bool
 	profileName        string
 	configPath         string
 
@@ -80,6 +84,7 @@ func init() {
 	)
 
 	upCmd.PersistentFlags().BoolVar(&noBrowser, noBrowserFlag, false, noBrowserDesc)
+	upCmd.PersistentFlags().BoolVar(&showQR, showQRFlag, false, showQRDesc)
 	upCmd.PersistentFlags().StringVar(&profileName, profileNameFlag, "", profileNameDesc)
 	upCmd.PersistentFlags().StringVarP(&configPath, "config", "c", "", "(DEPRECATED) NetBird config file location. ")
 

client/internal/debug/debug.go

@@ -607,6 +607,12 @@ func (g *BundleGenerator) addCommonConfigFields(configContent *strings.Builder)
 	if g.internalConfig.EnableSSHRemotePortForwarding != nil {
 		configContent.WriteString(fmt.Sprintf("EnableSSHRemotePortForwarding: %v\n", *g.internalConfig.EnableSSHRemotePortForwarding))
 	}
+	if g.internalConfig.DisableSSHAuth != nil {
+		configContent.WriteString(fmt.Sprintf("DisableSSHAuth: %v\n", *g.internalConfig.DisableSSHAuth))
+	}
+	if g.internalConfig.SSHJWTCacheTTL != nil {
+		configContent.WriteString(fmt.Sprintf("SSHJWTCacheTTL: %d\n", *g.internalConfig.SSHJWTCacheTTL))
+	}
 
 	configContent.WriteString(fmt.Sprintf("DisableClientRoutes: %v\n", g.internalConfig.DisableClientRoutes))
 	configContent.WriteString(fmt.Sprintf("DisableServerRoutes: %v\n", g.internalConfig.DisableServerRoutes))
@@ -633,6 +639,7 @@ func (g *BundleGenerator) addCommonConfigFields(configContent *strings.Builder)
 	}
 
 	configContent.WriteString(fmt.Sprintf("LazyConnectionEnabled: %v\n", g.internalConfig.LazyConnectionEnabled))
+	configContent.WriteString(fmt.Sprintf("MTU: %d\n", g.internalConfig.MTU))
 }
 
 func (g *BundleGenerator) addProf() (err error) {

client/internal/debug/debug_test.go

@@ -5,16 +5,21 @@ import (
 	"bytes"
 	"encoding/json"
 	"net"
+	"net/url"
 	"os"
 	"path/filepath"
+	"reflect"
 	"strings"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
 	"github.com/netbirdio/netbird/client/anonymize"
 	"github.com/netbirdio/netbird/client/configs"
+	"github.com/netbirdio/netbird/client/internal/profilemanager"
+	"github.com/netbirdio/netbird/shared/management/domain"
 	mgmProto "github.com/netbirdio/netbird/shared/management/proto"
 )
 
@@ -471,8 +476,8 @@ func TestSanitizeServiceEnvVars(t *testing.T) {
 			anonymize: false,
 			input: map[string]any{
 				jsonKeyServiceEnv: map[string]any{
-					"HOME":       "/root",
-					"PATH":       "/usr/bin",
+					"HOME":         "/root",
+					"PATH":         "/usr/bin",
 					"NB_LOG_LEVEL": "debug",
 				},
 			},
@@ -489,9 +494,9 @@ func TestSanitizeServiceEnvVars(t *testing.T) {
 			anonymize: false,
 			input: map[string]any{
 				jsonKeyServiceEnv: map[string]any{
-					"NB_SETUP_KEY":  "abc123",
-					"NB_API_TOKEN":  "tok_xyz",
-					"NB_LOG_LEVEL":  "info",
+					"NB_SETUP_KEY": "abc123",
+					"NB_API_TOKEN": "tok_xyz",
+					"NB_LOG_LEVEL": "info",
 				},
 			},
 			check: func(t *testing.T, params map[string]any) {
@@ -766,3 +771,127 @@ Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 	assert.Contains(t, anonNftables, "chain input {")
 	assert.Contains(t, anonNftables, "type filter hook input priority filter; policy accept;")
 }
+
+// TestAddConfig_AllFieldsCovered uses reflection to ensure every field in
+// profilemanager.Config is either rendered in the debug bundle or explicitly
+// excluded. When a new field is added to Config, this test fails until the
+// developer either dumps it in addConfig/addCommonConfigFields or adds it to
+// the excluded set with a justification.
+func TestAddConfig_AllFieldsCovered(t *testing.T) {
+	excluded := map[string]string{
+		"PrivateKey":        "sensitive: WireGuard private key",
+		"PreSharedKey":      "sensitive: WireGuard pre-shared key",
+		"SSHKey":            "sensitive: SSH private key",
+		"ClientCertKeyPair": "non-config: parsed cert pair, not serialized",
+	}
+
+	mURL, _ := url.Parse("https://api.example.com:443")
+	aURL, _ := url.Parse("https://admin.example.com:443")
+	bTrue := true
+	iVal := 42
+	cfg := &profilemanager.Config{
+		PrivateKey:                    "priv",
+		PreSharedKey:                  "psk",
+		ManagementURL:                 mURL,
+		AdminURL:                      aURL,
+		WgIface:                       "wt0",
+		WgPort:                        51820,
+		NetworkMonitor:                &bTrue,
+		IFaceBlackList:                []string{"eth0"},
+		DisableIPv6Discovery:          true,
+		RosenpassEnabled:              true,
+		RosenpassPermissive:           true,
+		ServerSSHAllowed:              &bTrue,
+		EnableSSHRoot:                 &bTrue,
+		EnableSSHSFTP:                 &bTrue,
+		EnableSSHLocalPortForwarding:  &bTrue,
+		EnableSSHRemotePortForwarding: &bTrue,
+		DisableSSHAuth:                &bTrue,
+		SSHJWTCacheTTL:                &iVal,
+		DisableClientRoutes:           true,
+		DisableServerRoutes:           true,
+		DisableDNS:                    true,
+		DisableFirewall:               true,
+		BlockLANAccess:                true,
+		BlockInbound:                  true,
+		DisableNotifications:          &bTrue,
+		DNSLabels:                     domain.List{},
+		SSHKey:                        "sshkey",
+		NATExternalIPs:                []string{"1.2.3.4"},
+		CustomDNSAddress:              "1.1.1.1:53",
+		DisableAutoConnect:            true,
+		DNSRouteInterval:              5 * time.Second,
+		ClientCertPath:                "/tmp/cert",
+		ClientCertKeyPath:             "/tmp/key",
+		LazyConnectionEnabled:         true,
+		MTU:                           1280,
+	}
+
+	for _, anonymize := range []bool{false, true} {
+		t.Run("anonymize="+map[bool]string{true: "true", false: "false"}[anonymize], func(t *testing.T) {
+			g := &BundleGenerator{
+				anonymizer:     newAnonymizerForTest(),
+				internalConfig: cfg,
+				anonymize:      anonymize,
+			}
+
+			var sb strings.Builder
+			g.addCommonConfigFields(&sb)
+			rendered := sb.String() + renderAddConfigSpecific(g)
+
+			val := reflect.ValueOf(cfg).Elem()
+			typ := val.Type()
+			var missing []string
+			for i := 0; i < typ.NumField(); i++ {
+				name := typ.Field(i).Name
+				if _, ok := excluded[name]; ok {
+					continue
+				}
+				if !strings.Contains(rendered, name+":") {
+					missing = append(missing, name)
+				}
+			}
+			if len(missing) > 0 {
+				t.Fatalf("Config field(s) not present in debug bundle output: %v\n"+
+					"Either render the field in addCommonConfigFields/addConfig, "+
+					"or add it to the excluded map with a justification.", missing)
+			}
+		})
+	}
+}
+
+// renderAddConfigSpecific renders the fields handled by the anonymize/non-anonymize
+// branches in addConfig (ManagementURL, AdminURL, NATExternalIPs, CustomDNSAddress).
+// addCommonConfigFields covers the rest. Keeping this in the test mirrors the
+// production shape without needing to write an actual zip.
+func renderAddConfigSpecific(g *BundleGenerator) string {
+	var sb strings.Builder
+	if g.anonymize {
+		if g.internalConfig.ManagementURL != nil {
+			sb.WriteString("ManagementURL: " + g.anonymizer.AnonymizeURI(g.internalConfig.ManagementURL.String()) + "\n")
+		}
+		if g.internalConfig.AdminURL != nil {
+			sb.WriteString("AdminURL: " + g.anonymizer.AnonymizeURI(g.internalConfig.AdminURL.String()) + "\n")
+		}
+		sb.WriteString("NATExternalIPs: x\n")
+		if g.internalConfig.CustomDNSAddress != "" {
+			sb.WriteString("CustomDNSAddress: " + g.anonymizer.AnonymizeString(g.internalConfig.CustomDNSAddress) + "\n")
+		}
+	} else {
+		if g.internalConfig.ManagementURL != nil {
+			sb.WriteString("ManagementURL: " + g.internalConfig.ManagementURL.String() + "\n")
+		}
+		if g.internalConfig.AdminURL != nil {
+			sb.WriteString("AdminURL: " + g.internalConfig.AdminURL.String() + "\n")
+		}
+		sb.WriteString("NATExternalIPs: x\n")
+		if g.internalConfig.CustomDNSAddress != "" {
+			sb.WriteString("CustomDNSAddress: " + g.internalConfig.CustomDNSAddress + "\n")
+		}
+	}
+	return sb.String()
+}
+
+func newAnonymizerForTest() *anonymize.Anonymizer {
+	return anonymize.NewAnonymizer(anonymize.DefaultAddresses())
+}

client/internal/wg_iface_monitor.go

@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"net"
 	"runtime"
-	"time"
 
 	log "github.com/sirupsen/logrus"
 
@@ -28,6 +27,10 @@ func NewWGIfaceMonitor() *WGIfaceMonitor {
 
 // Start begins monitoring the WireGuard interface.
 // It relies on the provided context cancellation to stop.
+//
+// On Linux the watcher is event-driven (RTNLGRP_LINK netlink subscription)
+// to avoid the allocation churn of repeatedly dumping the kernel link
+// table; on other platforms it falls back to a low-frequency poll.
 func (m *WGIfaceMonitor) Start(ctx context.Context, ifaceName string) (shouldRestart bool, err error) {
 	defer close(m.done)
 
@@ -56,31 +59,7 @@ func (m *WGIfaceMonitor) Start(ctx context.Context, ifaceName string) (shouldRes
 
 	log.Infof("Interface monitor: watching %s (index: %d)", ifaceName, expectedIndex)
 
-	ticker := time.NewTicker(2 * time.Second)
-	defer ticker.Stop()
-
-	for {
-		select {
-		case <-ctx.Done():
-			log.Infof("Interface monitor: stopped for %s", ifaceName)
-			return false, fmt.Errorf("wg interface monitor stopped: %v", ctx.Err())
-		case <-ticker.C:
-			currentIndex, err := getInterfaceIndex(ifaceName)
-			if err != nil {
-				// Interface was deleted
-				log.Infof("Interface monitor: %s deleted", ifaceName)
-				return true, fmt.Errorf("interface %s deleted: %w", ifaceName, err)
-			}
-
-			// Check if interface index changed (interface was recreated)
-			if currentIndex != expectedIndex {
-				log.Infof("Interface monitor: %s recreated (index changed from %d to %d), restarting engine",
-					ifaceName, expectedIndex, currentIndex)
-				return true, nil
-			}
-		}
-	}
-
+	return watchInterface(ctx, ifaceName, expectedIndex)
 }
 
 // getInterfaceIndex returns the index of a network interface by name.

client/internal/wg_iface_monitor_linux.go

@@ -0,0 +1,134 @@
+//go:build linux
+
+package internal
+
+import (
+	"context"
+	"fmt"
+	"syscall"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/vishvananda/netlink"
+)
+
+// watchInterface uses an RTNLGRP_LINK netlink subscription to detect
+// deletion or recreation of the WireGuard interface.
+//
+// The previous implementation polled net.InterfaceByName every 2 s, which
+// on Linux issues syscall.NetlinkRIB(RTM_GETLINK, ...) and dumps the
+// entire kernel link table on every call. On hosts with many veth
+// interfaces (containers, bridges) the resulting allocation churn was on
+// the order of ~1 GB/day from this single ticker, which on small ARM
+// hosts manifested as a slow RSS climb (see netbirdio/netbird#3678).
+//
+// The event-driven version below allocates only when the kernel actually
+// publishes a link event for the tracked interface — typically zero
+// allocations between events.
+func watchInterface(ctx context.Context, ifaceName string, expectedIndex int) (bool, error) {
+	done := make(chan struct{})
+	defer close(done)
+
+	// Buffer the channel to absorb event bursts (e.g. when many veth
+	// pairs are created/destroyed at once by container runtimes).
+	linkChan := make(chan netlink.LinkUpdate, 32)
+	if err := netlink.LinkSubscribe(linkChan, done); err != nil {
+		// Return shouldRestart=true so the engine recovers monitoring
+		// via triggerClientRestart instead of silently losing it for
+		// the rest of the process lifetime.
+		return true, fmt.Errorf("subscribe to link updates: %w", err)
+	}
+
+	// Race window: the interface could have been deleted (or recreated)
+	// between the initial getInterfaceIndex() in Start and LinkSubscribe
+	// completing its handshake with the kernel. Re-check explicitly so we
+	// do not block forever waiting for an event that already fired.
+	if currentIndex, err := getInterfaceIndex(ifaceName); err != nil {
+		log.Infof("Interface monitor: %s deleted before subscription completed", ifaceName)
+		return true, fmt.Errorf("interface %s deleted: %w", ifaceName, err)
+	} else if currentIndex != expectedIndex {
+		log.Infof("Interface monitor: %s recreated (index changed from %d to %d) before subscription completed",
+			ifaceName, expectedIndex, currentIndex)
+		return true, nil
+	}
+
+	for {
+		select {
+		case <-ctx.Done():
+			log.Infof("Interface monitor: stopped for %s", ifaceName)
+			return false, fmt.Errorf("wg interface monitor stopped: %w", ctx.Err())
+
+		case update, ok := <-linkChan:
+			if !ok {
+				// The vishvananda/netlink subscription goroutine closes
+				// the channel on receive errors. Signal the engine to
+				// restart so monitoring is re-established instead of
+				// silently ending.
+				log.Warnf("Interface monitor: link subscription channel closed unexpectedly for %s", ifaceName)
+				return true, fmt.Errorf("link subscription channel closed unexpectedly")
+			}
+			if restart, err := inspectLinkEvent(update, ifaceName, expectedIndex); restart {
+				return true, err
+			}
+		}
+	}
+}
+
+// inspectLinkEvent classifies a single netlink link update against the
+// tracked WireGuard interface. It returns (true, err) when the engine
+// should restart monitoring; (false, nil) means the event is unrelated
+// and the caller should keep waiting.
+//
+// The error component, when non-nil, describes the kernel-side reason
+// (deletion or rename); the recreation case returns (true, nil) since
+// no error condition is reported.
+func inspectLinkEvent(update netlink.LinkUpdate, ifaceName string, expectedIndex int) (bool, error) {
+	eventIndex := int(update.Index)
+	eventName := ""
+	if attrs := update.Attrs(); attrs != nil {
+		eventName = attrs.Name
+	}
+
+	switch update.Header.Type {
+	case syscall.RTM_DELLINK:
+		return inspectDelLink(eventIndex, ifaceName, expectedIndex)
+	case syscall.RTM_NEWLINK:
+		return inspectNewLink(eventIndex, eventName, ifaceName, expectedIndex)
+	}
+	return false, nil
+}
+
+// inspectDelLink reports a restart when an RTM_DELLINK arrives for the
+// tracked interface index.
+func inspectDelLink(eventIndex int, ifaceName string, expectedIndex int) (bool, error) {
+	if eventIndex != expectedIndex {
+		return false, nil
+	}
+	log.Infof("Interface monitor: %s deleted", ifaceName)
+	return true, fmt.Errorf("interface %s deleted", ifaceName)
+}
+
+// inspectNewLink reports a restart when an RTM_NEWLINK either:
+//
+//  1. Introduces a link with our name at a different index (recreation
+//     after a delete), or
+//
+//  2. Reports a link still at our index but with a different name
+//     (in-place rename). The previous polling implementation caught
+//     this implicitly because net.InterfaceByName(ifaceName) would
+//     start failing; the event-driven version has to test it.
+//
+// Same name + same index is just a flag/state change on the existing
+// interface and is ignored.
+func inspectNewLink(eventIndex int, eventName, ifaceName string, expectedIndex int) (bool, error) {
+	if eventName == ifaceName && eventIndex != expectedIndex {
+		log.Infof("Interface monitor: %s recreated (index changed from %d to %d), restarting engine",
+			ifaceName, expectedIndex, eventIndex)
+		return true, nil
+	}
+	if eventIndex == expectedIndex && eventName != "" && eventName != ifaceName {
+		log.Infof("Interface monitor: %s renamed to %s (index %d), restarting engine",
+			ifaceName, eventName, expectedIndex)
+		return true, fmt.Errorf("interface %s renamed to %s", ifaceName, eventName)
+	}
+	return false, nil
+}

client/internal/wg_iface_monitor_other.go

@@ -0,0 +1,56 @@
+//go:build !linux
+
+package internal
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	log "github.com/sirupsen/logrus"
+)
+
+// watchInterface polls net.InterfaceByName at a fixed interval to detect
+// deletion or recreation of the WireGuard interface.
+//
+// This is the fallback used on non-Linux desktop and server platforms
+// (darwin, windows, freebsd). It is also compiled on android and ios so
+// the package builds on every supported GOOS, but it is never reached
+// at runtime there because Start() in wg_iface_monitor.go exits early
+// on mobile platforms.
+//
+// The Linux build (see wg_iface_monitor_linux.go) uses an event-driven
+// RTNLGRP_LINK netlink subscription instead, because on Linux
+// net.InterfaceByName issues syscall.NetlinkRIB(RTM_GETLINK, ...) which
+// dumps the entire kernel link table on every call and produces
+// significant allocation churn (netbirdio/netbird#3678).
+//
+// Windows is also reported in #3678 as affected by RSS climb. A future
+// follow-up could implement an event-driven watcher there using
+// NotifyIpInterfaceChange from iphlpapi.
+func watchInterface(ctx context.Context, ifaceName string, expectedIndex int) (bool, error) {
+	ticker := time.NewTicker(2 * time.Second)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			log.Infof("Interface monitor: stopped for %s", ifaceName)
+			return false, fmt.Errorf("wg interface monitor stopped: %w", ctx.Err())
+		case <-ticker.C:
+			currentIndex, err := getInterfaceIndex(ifaceName)
+			if err != nil {
+				// Interface was deleted
+				log.Infof("Interface monitor: %s deleted", ifaceName)
+				return true, fmt.Errorf("interface %s deleted: %w", ifaceName, err)
+			}
+
+			// Check if interface index changed (interface was recreated)
+			if currentIndex != expectedIndex {
+				log.Infof("Interface monitor: %s recreated (index changed from %d to %d), restarting engine",
+					ifaceName, expectedIndex, currentIndex)
+				return true, nil
+			}
+		}
+	}
+}

client/ssh/config/manager.go

@@ -224,15 +224,20 @@ func (m *Manager) buildHostPatterns(peer PeerSSHInfo) []string {
 
 func (m *Manager) writeSSHConfig(sshConfig string) error {
 	sshConfigPath := filepath.Join(m.sshConfigDir, m.sshConfigFile)
+	sshConfigPathTmp := sshConfigPath + ".tmp"
 
 	if err := os.MkdirAll(m.sshConfigDir, 0755); err != nil {
 		return fmt.Errorf("create SSH config directory %s: %w", m.sshConfigDir, err)
 	}
 
-	if err := writeFileWithTimeout(sshConfigPath, []byte(sshConfig), 0644); err != nil {
+	if err := writeFileWithTimeout(sshConfigPathTmp, []byte(sshConfig), 0644); err != nil {
 		return fmt.Errorf("write SSH config file %s: %w", sshConfigPath, err)
 	}
 
+	if err := os.Rename(sshConfigPathTmp, sshConfigPath); err != nil {
+		return fmt.Errorf("rename ssh config %s -> %s: %w", sshConfigPathTmp, sshConfigPath, err)
+	}
+
 	log.Infof("Created NetBird SSH client config: %s", sshConfigPath)
 	return nil
 }

go.mod

@@ -71,6 +71,7 @@ require (
 	github.com/libp2p/go-netroute v0.2.1
 	github.com/lrh3321/ipset-go v0.0.0-20250619021614-54a0a98ace81
 	github.com/mdlayher/socket v0.5.1
+	github.com/mdp/qrterminal/v3 v3.2.1
 	github.com/miekg/dns v1.1.59
 	github.com/mitchellh/hashstructure/v2 v2.0.2
 	github.com/netbirdio/management-integrations/integrations v0.0.0-20260416123949-2355d972be42
@@ -309,6 +310,7 @@ require (
 	gopkg.in/square/go-jose.v2 v2.6.0 // indirect
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
+	rsc.io/qr v0.2.0 // indirect
 )
 
 replace github.com/kardianos/service => github.com/netbirdio/service v0.0.0-20240911161631-f62744f42502

go.sum

@@ -415,6 +415,8 @@ github.com/mdlayher/netlink v1.7.3-0.20250113171957-fbb4dce95f42 h1:A1Cq6Ysb0GM0
 github.com/mdlayher/netlink v1.7.3-0.20250113171957-fbb4dce95f42/go.mod h1:BB4YCPDOzfy7FniQ/lxuYQ3dgmM2cZumHbK8RpTjN2o=
 github.com/mdlayher/socket v0.5.1 h1:VZaqt6RkGkt2OE9l3GcC6nZkqD3xKeQLyfleW/uBcos=
 github.com/mdlayher/socket v0.5.1/go.mod h1:TjPLHI1UgwEv5J1B5q0zTZq12A/6H7nKmtTanQE37IQ=
+github.com/mdp/qrterminal/v3 v3.2.1 h1:6+yQjiiOsSuXT5n9/m60E54vdgFsw0zhADHhHLrFet4=
+github.com/mdp/qrterminal/v3 v3.2.1/go.mod h1:jOTmXvnBsMy5xqLniO0R++Jmjs2sTm9dFSuQ5kpz/SU=
 github.com/mholt/acmez/v2 v2.0.1 h1:3/3N0u1pLjMK4sNEAFSI+bcvzbPhRpY383sy1kLHJ6k=
 github.com/mholt/acmez/v2 v2.0.1/go.mod h1:fX4c9r5jYwMyMsC+7tkYRxHibkOTgta5DIFGoe67e1U=
 github.com/miekg/dns v1.1.59 h1:C9EXc/UToRwKLhK5wKU/I4QVsBUc8kE6MkHBkeypWZs=
@@ -915,3 +917,5 @@ gotest.tools/v3 v3.5.1 h1:EENdUnS3pdur5nybKYIh2Vfgc8IUNBjxDPSjtiJcOzU=
 gotest.tools/v3 v3.5.1/go.mod h1:isy3WKz7GK6uNw/sbHzfKBLvlvXwUyV06n6brMxxopU=
 gvisor.dev/gvisor v0.0.0-20260219192049-0f2374377e89 h1:mGJaeA61P8dEHTqdvAgc70ZIV3QoUoJcXCRyyjO26OA=
 gvisor.dev/gvisor v0.0.0-20260219192049-0f2374377e89/go.mod h1:QkHjoMIBaYtpVufgwv3keYAbln78mBoCuShZrPrer1Q=
+rsc.io/qr v0.2.0 h1:6vBLea5/NRMVTz8V66gipeLycZMl/+UlFmk8DvqQ6WY=
+rsc.io/qr v0.2.0/go.mod h1:IF+uZjkb9fqyeF/4tlBoynqmQxUoPfWEKh921coOuXs=

management/internals/modules/reverseproxy/proxy/manager.go

@@ -11,9 +11,9 @@ import (
 
 // Manager defines the interface for proxy operations
 type Manager interface {
-	Connect(ctx context.Context, proxyID, clusterAddress, ipAddress string, capabilities *Capabilities) error
-	Disconnect(ctx context.Context, proxyID string) error
-	Heartbeat(ctx context.Context, proxyID, clusterAddress, ipAddress string) error
+	Connect(ctx context.Context, proxyID, sessionID, clusterAddress, ipAddress string, capabilities *Capabilities) (*Proxy, error)
+	Disconnect(ctx context.Context, proxyID, sessionID string) error
+	Heartbeat(ctx context.Context, p *Proxy) error
 	GetActiveClusterAddresses(ctx context.Context) ([]string, error)
 	GetActiveClusters(ctx context.Context) ([]Cluster, error)
 	ClusterSupportsCustomPorts(ctx context.Context, clusterAddr string) *bool

management/internals/modules/reverseproxy/proxy/manager/manager.go

@@ -13,7 +13,8 @@ import (
 // store defines the interface for proxy persistence operations
 type store interface {
 	SaveProxy(ctx context.Context, p *proxy.Proxy) error
-	UpdateProxyHeartbeat(ctx context.Context, proxyID, clusterAddress, ipAddress string) error
+	DisconnectProxy(ctx context.Context, proxyID, sessionID string) error
+	UpdateProxyHeartbeat(ctx context.Context, p *proxy.Proxy) error
 	GetActiveProxyClusterAddresses(ctx context.Context) ([]string, error)
 	GetActiveProxyClusters(ctx context.Context) ([]proxy.Cluster, error)
 	GetClusterSupportsCustomPorts(ctx context.Context, clusterAddr string) *bool
@@ -43,7 +44,7 @@ func NewManager(store store, meter metric.Meter) (*Manager, error) {
 
 // Connect registers a new proxy connection in the database.
 // capabilities may be nil for old proxies that do not report them.
-func (m Manager) Connect(ctx context.Context, proxyID, clusterAddress, ipAddress string, capabilities *proxy.Capabilities) error {
+func (m Manager) Connect(ctx context.Context, proxyID, sessionID, clusterAddress, ipAddress string, capabilities *proxy.Capabilities) (*proxy.Proxy, error) {
 	now := time.Now()
 	var caps proxy.Capabilities
 	if capabilities != nil {
@@ -51,6 +52,7 @@ func (m Manager) Connect(ctx context.Context, proxyID, clusterAddress, ipAddress
 	}
 	p := &proxy.Proxy{
 		ID:             proxyID,
+		SessionID:      sessionID,
 		ClusterAddress: clusterAddress,
 		IPAddress:      ipAddress,
 		LastSeen:       now,
@@ -61,48 +63,42 @@ func (m Manager) Connect(ctx context.Context, proxyID, clusterAddress, ipAddress
 
 	if err := m.store.SaveProxy(ctx, p); err != nil {
 		log.WithContext(ctx).Errorf("failed to register proxy %s: %v", proxyID, err)
-		return err
+		return nil, err
 	}
 
 	log.WithContext(ctx).WithFields(log.Fields{
 		"proxyID":        proxyID,
+		"sessionID":      sessionID,
 		"clusterAddress": clusterAddress,
 		"ipAddress":      ipAddress,
 	}).Info("proxy connected")
 
-	return nil
+	return p, nil
 }
 
-// Disconnect marks a proxy as disconnected in the database
-func (m Manager) Disconnect(ctx context.Context, proxyID string) error {
-	now := time.Now()
-	p := &proxy.Proxy{
-		ID:             proxyID,
-		Status:         "disconnected",
-		DisconnectedAt: &now,
-		LastSeen:       now,
-	}
-
-	if err := m.store.SaveProxy(ctx, p); err != nil {
-		log.WithContext(ctx).Errorf("failed to disconnect proxy %s: %v", proxyID, err)
+// Disconnect marks a proxy as disconnected in the database.
+func (m Manager) Disconnect(ctx context.Context, proxyID, sessionID string) error {
+	if err := m.store.DisconnectProxy(ctx, proxyID, sessionID); err != nil {
+		log.WithContext(ctx).Errorf("failed to disconnect proxy %s session %s: %v", proxyID, sessionID, err)
 		return err
 	}
 
 	log.WithContext(ctx).WithFields(log.Fields{
-		"proxyID": proxyID,
+		"proxyID":   proxyID,
+		"sessionID": sessionID,
 	}).Info("proxy disconnected")
 
 	return nil
 }
 
-// Heartbeat updates the proxy's last seen timestamp
-func (m Manager) Heartbeat(ctx context.Context, proxyID, clusterAddress, ipAddress string) error {
-	if err := m.store.UpdateProxyHeartbeat(ctx, proxyID, clusterAddress, ipAddress); err != nil {
-		log.WithContext(ctx).Debugf("failed to update proxy %s heartbeat: %v", proxyID, err)
+// Heartbeat updates the proxy's last seen timestamp.
+func (m Manager) Heartbeat(ctx context.Context, p *proxy.Proxy) error {
+	if err := m.store.UpdateProxyHeartbeat(ctx, p); err != nil {
+		log.WithContext(ctx).Debugf("failed to update proxy %s heartbeat: %v", p.ID, err)
 		return err
 	}
 
-	log.WithContext(ctx).Tracef("updated heartbeat for proxy %s", proxyID)
+	log.WithContext(ctx).Tracef("updated heartbeat for proxy %s session %s", p.ID, p.SessionID)
 	m.metrics.IncrementProxyHeartbeatCount()
 	return nil
 }

management/internals/modules/reverseproxy/proxy/manager_mock.go

@@ -93,31 +93,32 @@ func (mr *MockManagerMockRecorder) ClusterSupportsCrowdSec(ctx, clusterAddr inte
 }
 
 // Connect mocks base method.
-func (m *MockManager) Connect(ctx context.Context, proxyID, clusterAddress, ipAddress string, capabilities *Capabilities) error {
+func (m *MockManager) Connect(ctx context.Context, proxyID, sessionID, clusterAddress, ipAddress string, capabilities *Capabilities) (*Proxy, error) {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Connect", ctx, proxyID, clusterAddress, ipAddress, capabilities)
-	ret0, _ := ret[0].(error)
-	return ret0
+	ret := m.ctrl.Call(m, "Connect", ctx, proxyID, sessionID, clusterAddress, ipAddress, capabilities)
+	ret0, _ := ret[0].(*Proxy)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
 }
 
 // Connect indicates an expected call of Connect.
-func (mr *MockManagerMockRecorder) Connect(ctx, proxyID, clusterAddress, ipAddress, capabilities interface{}) *gomock.Call {
+func (mr *MockManagerMockRecorder) Connect(ctx, proxyID, sessionID, clusterAddress, ipAddress, capabilities interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Connect", reflect.TypeOf((*MockManager)(nil).Connect), ctx, proxyID, clusterAddress, ipAddress, capabilities)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Connect", reflect.TypeOf((*MockManager)(nil).Connect), ctx, proxyID, sessionID, clusterAddress, ipAddress, capabilities)
 }
 
 // Disconnect mocks base method.
-func (m *MockManager) Disconnect(ctx context.Context, proxyID string) error {
+func (m *MockManager) Disconnect(ctx context.Context, proxyID, sessionID string) error {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Disconnect", ctx, proxyID)
+	ret := m.ctrl.Call(m, "Disconnect", ctx, proxyID, sessionID)
 	ret0, _ := ret[0].(error)
 	return ret0
 }
 
 // Disconnect indicates an expected call of Disconnect.
-func (mr *MockManagerMockRecorder) Disconnect(ctx, proxyID interface{}) *gomock.Call {
+func (mr *MockManagerMockRecorder) Disconnect(ctx, proxyID, sessionID interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Disconnect", reflect.TypeOf((*MockManager)(nil).Disconnect), ctx, proxyID)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Disconnect", reflect.TypeOf((*MockManager)(nil).Disconnect), ctx, proxyID, sessionID)
 }
 
 // GetActiveClusterAddresses mocks base method.
@@ -151,17 +152,17 @@ func (mr *MockManagerMockRecorder) GetActiveClusters(ctx interface{}) *gomock.Ca
 }
 
 // Heartbeat mocks base method.
-func (m *MockManager) Heartbeat(ctx context.Context, proxyID, clusterAddress, ipAddress string) error {
+func (m *MockManager) Heartbeat(ctx context.Context, p *Proxy) error {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Heartbeat", ctx, proxyID, clusterAddress, ipAddress)
+	ret := m.ctrl.Call(m, "Heartbeat", ctx, p)
 	ret0, _ := ret[0].(error)
 	return ret0
 }
 
 // Heartbeat indicates an expected call of Heartbeat.
-func (mr *MockManagerMockRecorder) Heartbeat(ctx, proxyID, clusterAddress, ipAddress interface{}) *gomock.Call {
+func (mr *MockManagerMockRecorder) Heartbeat(ctx, p interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Heartbeat", reflect.TypeOf((*MockManager)(nil).Heartbeat), ctx, proxyID, clusterAddress, ipAddress)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Heartbeat", reflect.TypeOf((*MockManager)(nil).Heartbeat), ctx, p)
 }
 
 // MockController is a mock of Controller interface.

management/internals/modules/reverseproxy/proxy/proxy.go

@@ -18,12 +18,13 @@ type Capabilities struct {
 // Proxy represents a reverse proxy instance
 type Proxy struct {
 	ID             string    `gorm:"primaryKey;type:varchar(255)"`
+	SessionID      string    `gorm:"type:varchar(36)"`
 	ClusterAddress string    `gorm:"type:varchar(255);not null;index:idx_proxy_cluster_status"`
 	IPAddress      string    `gorm:"type:varchar(45)"`
 	LastSeen       time.Time `gorm:"not null;index:idx_proxy_last_seen"`
 	ConnectedAt    *time.Time
 	DisconnectedAt *time.Time
-	Status         string `gorm:"type:varchar(20);not null;index:idx_proxy_cluster_status"`
+	Status         string       `gorm:"type:varchar(20);not null;index:idx_proxy_cluster_status"`
 	Capabilities   Capabilities `gorm:"embedded"`
 	CreatedAt      time.Time
 	UpdatedAt      time.Time

management/internals/shared/grpc/proxy.go

@@ -16,6 +16,7 @@ import (
 	"time"
 
 	"github.com/coreos/go-oidc/v3/oidc"
+	"github.com/google/uuid"
 	log "github.com/sirupsen/logrus"
 	"golang.org/x/oauth2"
 	"google.golang.org/grpc/codes"
@@ -89,6 +90,7 @@ const pkceVerifierTTL = 10 * time.Minute
 // proxyConnection represents a connected proxy
 type proxyConnection struct {
 	proxyID      string
+	sessionID    string
 	address      string
 	capabilities *proto.ProxyCapabilities
 	stream       proto.ProxyService_GetMappingUpdateServer
@@ -166,9 +168,22 @@ func (s *ProxyServiceServer) GetMappingUpdate(req *proto.GetMappingUpdateRequest
 		return status.Errorf(codes.InvalidArgument, "proxy address is invalid")
 	}
 
+	sessionID := uuid.NewString()
+
+	if old, loaded := s.connectedProxies.Load(proxyID); loaded {
+		oldConn := old.(*proxyConnection)
+		log.WithFields(log.Fields{
+			"proxy_id":       proxyID,
+			"old_session_id": oldConn.sessionID,
+			"new_session_id": sessionID,
+		}).Info("Superseding existing proxy connection")
+		oldConn.cancel()
+	}
+
 	connCtx, cancel := context.WithCancel(ctx)
 	conn := &proxyConnection{
 		proxyID:      proxyID,
+		sessionID:    sessionID,
 		address:      proxyAddress,
 		capabilities: req.GetCapabilities(),
 		stream:       stream,
@@ -188,12 +203,13 @@ func (s *ProxyServiceServer) GetMappingUpdate(req *proto.GetMappingUpdateRequest
 		caps = &proxy.Capabilities{
 			SupportsCustomPorts: c.SupportsCustomPorts,
 			RequireSubdomain:    c.RequireSubdomain,
-			SupportsCrowdsec: c.SupportsCrowdsec,
+			SupportsCrowdsec:    c.SupportsCrowdsec,
 		}
 	}
-	if err := s.proxyManager.Connect(ctx, proxyID, proxyAddress, peerInfo, caps); err != nil {
+	proxyRecord, err := s.proxyManager.Connect(ctx, proxyID, sessionID, proxyAddress, peerInfo, caps)
+	if err != nil {
 		log.WithContext(ctx).Warnf("failed to register proxy %s in database: %v", proxyID, err)
-		s.connectedProxies.Delete(proxyID)
+		s.connectedProxies.CompareAndDelete(proxyID, conn)
 		if unregErr := s.proxyController.UnregisterProxyFromCluster(ctx, conn.address, proxyID); unregErr != nil {
 			log.WithContext(ctx).Debugf("cleanup after Connect failure for proxy %s: %v", proxyID, unregErr)
 		}
@@ -202,22 +218,27 @@ func (s *ProxyServiceServer) GetMappingUpdate(req *proto.GetMappingUpdateRequest
 
 	log.WithFields(log.Fields{
 		"proxy_id":      proxyID,
+		"session_id":    sessionID,
 		"address":       proxyAddress,
 		"cluster_addr":  proxyAddress,
 		"total_proxies": len(s.GetConnectedProxies()),
 	}).Info("Proxy registered in cluster")
 	defer func() {
-		if err := s.proxyManager.Disconnect(context.Background(), proxyID); err != nil {
-			log.Warnf("Failed to mark proxy %s as disconnected: %v", proxyID, err)
+		if !s.connectedProxies.CompareAndDelete(proxyID, conn) {
+			log.Infof("Proxy %s session %s: skipping cleanup, superseded by new connection", proxyID, sessionID)
+			cancel()
+			return
 		}
 
-		s.connectedProxies.Delete(proxyID)
 		if err := s.proxyController.UnregisterProxyFromCluster(context.Background(), conn.address, proxyID); err != nil {
 			log.Warnf("Failed to unregister proxy %s from cluster: %v", proxyID, err)
 		}
+		if err := s.proxyManager.Disconnect(context.Background(), proxyID, sessionID); err != nil {
+			log.Warnf("Failed to mark proxy %s as disconnected: %v", proxyID, err)
+		}
 
 		cancel()
-		log.Infof("Proxy %s disconnected", proxyID)
+		log.Infof("Proxy %s session %s disconnected", proxyID, sessionID)
 	}()
 
 	if err := s.sendSnapshot(ctx, conn); err != nil {
@@ -227,29 +248,31 @@ func (s *ProxyServiceServer) GetMappingUpdate(req *proto.GetMappingUpdateRequest
 	errChan := make(chan error, 2)
 	go s.sender(conn, errChan)
 
-	// Start heartbeat goroutine
-	go s.heartbeat(connCtx, proxyID, proxyAddress, peerInfo)
+	go s.heartbeat(connCtx, proxyRecord)
 
 	select {
 	case err := <-errChan:
+		log.WithContext(ctx).Warnf("Failed to send update: %v", err)
 		return fmt.Errorf("send update to proxy %s: %w", proxyID, err)
 	case <-connCtx.Done():
+		log.WithContext(ctx).Infof("Proxy %s context canceled", proxyID)
 		return connCtx.Err()
 	}
 }
 
 // heartbeat updates the proxy's last_seen timestamp every minute
-func (s *ProxyServiceServer) heartbeat(ctx context.Context, proxyID, clusterAddress, ipAddress string) {
+func (s *ProxyServiceServer) heartbeat(ctx context.Context, p *proxy.Proxy) {
 	ticker := time.NewTicker(1 * time.Minute)
 	defer ticker.Stop()
 
 	for {
 		select {
 		case <-ticker.C:
-			if err := s.proxyManager.Heartbeat(ctx, proxyID, clusterAddress, ipAddress); err != nil {
-				log.WithContext(ctx).Debugf("Failed to update proxy %s heartbeat: %v", proxyID, err)
+			if err := s.proxyManager.Heartbeat(ctx, p); err != nil {
+				log.WithContext(ctx).Debugf("Failed to update proxy %s heartbeat: %v", p.ID, err)
 			}
 		case <-ctx.Done():
+			log.WithContext(ctx).Infof("proxy %s heartbeat stopped: context canceled", p.ID)
 			return
 		}
 	}

management/server/store/sql_store.go

@@ -5437,13 +5437,35 @@ func (s *SqlStore) SaveProxy(ctx context.Context, p *proxy.Proxy) error {
 	return nil
 }
 
-// UpdateProxyHeartbeat updates the last_seen timestamp for a proxy or creates a new entry if it doesn't exist
-func (s *SqlStore) UpdateProxyHeartbeat(ctx context.Context, proxyID, clusterAddress, ipAddress string) error {
+// DisconnectProxy marks a proxy as disconnected only if the session ID matches.
+// This prevents a slow-to-close old session from overwriting a newer reconnection.
+func (s *SqlStore) DisconnectProxy(ctx context.Context, proxyID, sessionID string) error {
+	now := time.Now()
+	result := s.db.
+		Model(&proxy.Proxy{}).
+		Where("id = ? AND session_id = ?", proxyID, sessionID).
+		Updates(map[string]any{
+			"status":          "disconnected",
+			"disconnected_at": now,
+			"last_seen":       now,
+		})
+	if result.Error != nil {
+		log.WithContext(ctx).Errorf("failed to disconnect proxy %s session %s: %v", proxyID, sessionID, result.Error)
+		return status.Errorf(status.Internal, "failed to disconnect proxy")
+	}
+	if result.RowsAffected == 0 {
+		log.WithContext(ctx).Debugf("proxy %s session %s: no row updated (superseded by newer session)", proxyID, sessionID)
+	}
+	return nil
+}
+
+// UpdateProxyHeartbeat updates the last_seen timestamp for the proxy's current session.
+func (s *SqlStore) UpdateProxyHeartbeat(ctx context.Context, p *proxy.Proxy) error {
 	now := time.Now()
 
 	result := s.db.
 		Model(&proxy.Proxy{}).
-		Where("id = ? AND status = ?", proxyID, "connected").
+		Where("id = ? AND session_id = ?", p.ID, p.SessionID).
 		Update("last_seen", now)
 
 	if result.Error != nil {
@@ -5452,17 +5474,11 @@ func (s *SqlStore) UpdateProxyHeartbeat(ctx context.Context, proxyID, clusterAdd
 	}
 
 	if result.RowsAffected == 0 {
-		p := &proxy.Proxy{
-			ID:             proxyID,
-			ClusterAddress: clusterAddress,
-			IPAddress:      ipAddress,
-			LastSeen:       now,
-			ConnectedAt:    &now,
-			Status:         "connected",
-		}
-		if err := s.db.Save(p).Error; err != nil {
-			log.WithContext(ctx).Errorf("failed to create proxy on heartbeat: %v", err)
-			return status.Errorf(status.Internal, "failed to create proxy on heartbeat")
+		p.LastSeen = now
+		p.ConnectedAt = &now
+		p.Status = "connected"
+		if err := s.db.Create(p).Error; err != nil {
+			log.WithContext(ctx).Debugf("proxy %s session %s: heartbeat fallback insert skipped: %v", p.ID, p.SessionID, err)
 		}
 	}
 

management/server/store/store.go

@@ -284,7 +284,8 @@ type Store interface {
 	DeleteServiceTargets(ctx context.Context, accountID string, serviceID string) error
 
 	SaveProxy(ctx context.Context, proxy *proxy.Proxy) error
-	UpdateProxyHeartbeat(ctx context.Context, proxyID, clusterAddress, ipAddress string) error
+	DisconnectProxy(ctx context.Context, proxyID, sessionID string) error
+	UpdateProxyHeartbeat(ctx context.Context, p *proxy.Proxy) error
 	GetActiveProxyClusterAddresses(ctx context.Context) ([]string, error)
 	GetActiveProxyClusters(ctx context.Context) ([]proxy.Cluster, error)
 	GetClusterSupportsCustomPorts(ctx context.Context, clusterAddr string) *bool

management/server/store/store_mock.go

@@ -178,6 +178,7 @@ func (mr *MockStoreMockRecorder) GetClusterSupportsCrowdSec(ctx, clusterAddr int
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetClusterSupportsCrowdSec", reflect.TypeOf((*MockStore)(nil).GetClusterSupportsCrowdSec), ctx, clusterAddr)
 }
+
 // Close mocks base method.
 func (m *MockStore) Close(ctx context.Context) error {
 	m.ctrl.T.Helper()
@@ -2799,6 +2800,20 @@ func (mr *MockStoreMockRecorder) SaveProxy(ctx, proxy interface{}) *gomock.Call
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SaveProxy", reflect.TypeOf((*MockStore)(nil).SaveProxy), ctx, proxy)
 }
 
+// DisconnectProxy mocks base method.
+func (m *MockStore) DisconnectProxy(ctx context.Context, proxyID, sessionID string) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "DisconnectProxy", ctx, proxyID, sessionID)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// DisconnectProxy indicates an expected call of DisconnectProxy.
+func (mr *MockStoreMockRecorder) DisconnectProxy(ctx, proxyID, sessionID interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "DisconnectProxy", reflect.TypeOf((*MockStore)(nil).DisconnectProxy), ctx, proxyID, sessionID)
+}
+
 // SaveProxyAccessToken mocks base method.
 func (m *MockStore) SaveProxyAccessToken(ctx context.Context, token *types2.ProxyAccessToken) error {
 	m.ctrl.T.Helper()
@@ -2995,17 +3010,17 @@ func (mr *MockStoreMockRecorder) UpdateGroups(ctx, accountID, groups interface{}
 }
 
 // UpdateProxyHeartbeat mocks base method.
-func (m *MockStore) UpdateProxyHeartbeat(ctx context.Context, proxyID, clusterAddress, ipAddress string) error {
+func (m *MockStore) UpdateProxyHeartbeat(ctx context.Context, p *proxy.Proxy) error {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "UpdateProxyHeartbeat", ctx, proxyID, clusterAddress, ipAddress)
+	ret := m.ctrl.Call(m, "UpdateProxyHeartbeat", ctx, p)
 	ret0, _ := ret[0].(error)
 	return ret0
 }
 
 // UpdateProxyHeartbeat indicates an expected call of UpdateProxyHeartbeat.
-func (mr *MockStoreMockRecorder) UpdateProxyHeartbeat(ctx, proxyID, clusterAddress, ipAddress interface{}) *gomock.Call {
+func (mr *MockStoreMockRecorder) UpdateProxyHeartbeat(ctx, p interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "UpdateProxyHeartbeat", reflect.TypeOf((*MockStore)(nil).UpdateProxyHeartbeat), ctx, proxyID, clusterAddress, ipAddress)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "UpdateProxyHeartbeat", reflect.TypeOf((*MockStore)(nil).UpdateProxyHeartbeat), ctx, p)
 }
 
 // UpdateService mocks base method.

proxy/management_integration_test.go

@@ -201,15 +201,15 @@ func (m *testAccessLogManager) GetAllAccessLogs(_ context.Context, _, _ string,
 // testProxyManager is a mock implementation of proxy.Manager for testing.
 type testProxyManager struct{}
 
-func (m *testProxyManager) Connect(_ context.Context, _, _, _ string, _ *nbproxy.Capabilities) error {
+func (m *testProxyManager) Connect(_ context.Context, proxyID, sessionID, _, _ string, _ *nbproxy.Capabilities) (*nbproxy.Proxy, error) {
+	return &nbproxy.Proxy{ID: proxyID, SessionID: sessionID, Status: "connected"}, nil
+}
+
+func (m *testProxyManager) Disconnect(_ context.Context, _, _ string) error {
 	return nil
 }
 
-func (m *testProxyManager) Disconnect(_ context.Context, _ string) error {
-	return nil
-}
-
-func (m *testProxyManager) Heartbeat(_ context.Context, _, _, _ string) error {
+func (m *testProxyManager) Heartbeat(_ context.Context, _ *nbproxy.Proxy) error {
 	return nil
 }
 
@@ -656,3 +656,72 @@ func TestIntegration_ProxyConnection_MultipleProxiesReceiveUpdates(t *testing.T)
 		assert.Equal(t, 2, count, "Proxy %s should receive 2 mappings", proxyID)
 	}
 }
+
+// TestIntegration_ProxyConnection_FastReconnectDoesNotLoseState verifies that
+// when a proxy reconnects before the old stream's cleanup runs, the new
+// connection is NOT removed by the stale defer.
+func TestIntegration_ProxyConnection_FastReconnectDoesNotLoseState(t *testing.T) {
+	setup := setupIntegrationTest(t)
+	defer setup.cleanup()
+
+	clusterAddress := "test.proxy.io"
+	proxyID := "test-proxy-race"
+
+	conn, err := grpc.NewClient(setup.grpcAddr, grpc.WithTransportCredentials(insecure.NewCredentials()))
+	require.NoError(t, err)
+	defer conn.Close()
+
+	client := proto.NewProxyServiceClient(conn)
+
+	ctx1, cancel1 := context.WithCancel(context.Background())
+	stream1, err := client.GetMappingUpdate(ctx1, &proto.GetMappingUpdateRequest{
+		ProxyId: proxyID,
+		Version: "test-v1",
+		Address: clusterAddress,
+	})
+	require.NoError(t, err)
+
+	for i := 0; i < 2; i++ {
+		_, err := stream1.Recv()
+		require.NoError(t, err)
+	}
+
+	require.Contains(t, setup.proxyService.GetConnectedProxies(), proxyID,
+		"proxy should be registered after first connection")
+
+	ctx2, cancel2 := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel2()
+
+	stream2, err := client.GetMappingUpdate(ctx2, &proto.GetMappingUpdateRequest{
+		ProxyId: proxyID,
+		Version: "test-v1",
+		Address: clusterAddress,
+	})
+	require.NoError(t, err)
+
+	for i := 0; i < 2; i++ {
+		_, err := stream2.Recv()
+		require.NoError(t, err)
+	}
+
+	cancel1()
+
+	time.Sleep(200 * time.Millisecond)
+
+	assert.Contains(t, setup.proxyService.GetConnectedProxies(), proxyID,
+		"proxy should still be registered after old connection cleanup — old defer must not remove new connection")
+
+	setup.proxyService.SendServiceUpdate(&proto.GetMappingUpdateResponse{
+		Mapping: []*proto.ProxyMapping{{
+			Type:      proto.ProxyMappingUpdateType_UPDATE_TYPE_REMOVED,
+			Id:        "rp-1",
+			AccountId: "test-account-1",
+			Domain:    "app1.test.proxy.io",
+		}},
+	})
+
+	msg, err := stream2.Recv()
+	require.NoError(t, err, "new stream should still receive updates")
+	require.NotEmpty(t, msg.GetMapping(), "update should contain the mapping")
+	assert.Equal(t, "rp-1", msg.GetMapping()[0].GetId())
+}