diff --git a/client/iface/configurer/common.go b/client/iface/configurer/common.go
index 10162d703..1cdf9ab96 100644
--- a/client/iface/configurer/common.go
+++ b/client/iface/configurer/common.go
@@ -3,6 +3,7 @@ package configurer
 import (
 	"net"
 	"net/netip"
+	"time"
 
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 )
@@ -19,6 +20,43 @@ func buildPresharedKeyConfig(peerKey wgtypes.Key, psk wgtypes.Key, updateOnly bo
 	}
 }
 
+// buildIdlePeerEndpointConfig creates a config that removes and re-creates a peer in a
+// single transaction with the given allowed IPs, endpoint and disabled keepalive.
+func buildIdlePeerEndpointConfig(peerKey wgtypes.Key, allowedIPs []netip.Prefix, endpoint *net.UDPAddr) wgtypes.Config {
+	keepAlive := time.Duration(0)
+	return wgtypes.Config{
+		Peers: []wgtypes.PeerConfig{
+			{
+				PublicKey: peerKey,
+				Remove:    true,
+			},
+			{
+				PublicKey:                   peerKey,
+				AllowedIPs:                  prefixesToIPNets(allowedIPs),
+				Endpoint:                    endpoint,
+				PersistentKeepaliveInterval: &keepAlive,
+			},
+		},
+	}
+}
+
+// mergePrefixes returns the union of the two prefix lists, keeping the original order and
+// dropping duplicates.
+func mergePrefixes(current, base []netip.Prefix) []netip.Prefix {
+	merged := make([]netip.Prefix, 0, len(current)+len(base))
+	seen := make(map[netip.Prefix]struct{}, len(current)+len(base))
+	for _, group := range [][]netip.Prefix{current, base} {
+		for _, prefix := range group {
+			if _, ok := seen[prefix]; ok {
+				continue
+			}
+			seen[prefix] = struct{}{}
+			merged = append(merged, prefix)
+		}
+	}
+	return merged
+}
+
 func prefixesToIPNets(prefixes []netip.Prefix) []net.IPNet {
 	ipNets := make([]net.IPNet, len(prefixes))
 	for i, prefix := range prefixes {
diff --git a/client/iface/configurer/kernel_unix.go b/client/iface/configurer/kernel_unix.go
index da69c2a35..f335b5006 100644
--- a/client/iface/configurer/kernel_unix.go
+++ b/client/iface/configurer/kernel_unix.go
@@ -3,6 +3,7 @@
 package configurer
 
 import (
+	"errors"
 	"fmt"
 	"net"
 	"net/netip"
@@ -145,6 +146,39 @@ func (c *KernelConfigurer) RemovePeer(peerKey string) error {
 	return nil
 }
 
+// IdlePeerEndpoint re-creates the peer pointing at the lazy wake endpoint, dropping
+// handshake state while preserving the peer's currently installed allowed IPs.
+func (c *KernelConfigurer) IdlePeerEndpoint(peerKey string, allowedIPs []netip.Prefix, endpoint *net.UDPAddr) error {
+	peerKeyParsed, err := wgtypes.ParseKey(peerKey)
+	if err != nil {
+		return err
+	}
+
+	var current []netip.Prefix
+	existing, err := c.getPeer(c.deviceName, peerKey)
+	switch {
+	case errors.Is(err, ErrPeerNotFound):
+	case err != nil:
+		return fmt.Errorf("get peer: %w", err)
+	default:
+		for _, ipNet := range existing.AllowedIPs {
+			addr, ok := netip.AddrFromSlice(ipNet.IP)
+			if !ok {
+				log.Warnf("failed to convert allowed IP %s of peer %s", ipNet.String(), peerKey)
+				continue
+			}
+			ones, _ := ipNet.Mask.Size()
+			current = append(current, netip.PrefixFrom(addr.Unmap(), ones))
+		}
+	}
+
+	config := buildIdlePeerEndpointConfig(peerKeyParsed, mergePrefixes(current, allowedIPs), endpoint)
+	if err := c.configure(config); err != nil {
+		return fmt.Errorf(`received error "%w" while setting idle endpoint for peer %s on interface %s`, err, peerKey, c.deviceName)
+	}
+	return nil
+}
+
 func (c *KernelConfigurer) AddAllowedIP(peerKey string, allowedIP netip.Prefix) error {
 	ipNet := net.IPNet{
 		IP:   allowedIP.Addr().AsSlice(),
diff --git a/client/iface/configurer/usp.go b/client/iface/configurer/usp.go
index 0a25c55bc..e7b10903f 100644
--- a/client/iface/configurer/usp.go
+++ b/client/iface/configurer/usp.go
@@ -210,6 +210,64 @@ func (c *WGUSPConfigurer) RemovePeer(peerKey string) error {
 	return ipcErr
 }
 
+// IdlePeerEndpoint re-creates the peer pointing at the lazy wake endpoint, dropping
+// handshake state while preserving the peer's currently installed allowed IPs.
+func (c *WGUSPConfigurer) IdlePeerEndpoint(peerKey string, allowedIPs []netip.Prefix, endpoint *net.UDPAddr) error {
+	peerKeyParsed, err := wgtypes.ParseKey(peerKey)
+	if err != nil {
+		return err
+	}
+
+	current, err := c.currentAllowedIPs(hex.EncodeToString(peerKeyParsed[:]))
+	if err != nil {
+		return fmt.Errorf("get current allowed IPs: %w", err)
+	}
+
+	config := buildIdlePeerEndpointConfig(peerKeyParsed, mergePrefixes(current, allowedIPs), endpoint)
+	if err := c.device.IpcSet(toWgUserspaceString(config)); err != nil {
+		return fmt.Errorf("set idle peer endpoint: %w", err)
+	}
+
+	if endpoint != nil {
+		addr, err := netip.ParseAddr(endpoint.IP.String())
+		if err != nil {
+			return fmt.Errorf("parse endpoint address: %w", err)
+		}
+		c.activityRecorder.UpsertAddress(peerKey, netip.AddrPortFrom(addr.Unmap(), uint16(endpoint.Port)))
+	}
+	return nil
+}
+
+// currentAllowedIPs returns the allowed IPs currently installed for the peer identified by
+// its hex-encoded public key. It returns an empty list when the peer does not exist.
+func (c *WGUSPConfigurer) currentAllowedIPs(hexKey string) ([]netip.Prefix, error) {
+	ipc, err := c.device.IpcGet()
+	if err != nil {
+		return nil, err
+	}
+
+	var prefixes []netip.Prefix
+	foundPeer := false
+	for _, line := range strings.Split(ipc, "\n") {
+		line = strings.TrimSpace(line)
+		if strings.HasPrefix(line, "public_key=") {
+			foundPeer = line == "public_key="+hexKey
+			continue
+		}
+		if !foundPeer || !strings.HasPrefix(line, "allowed_ip=") {
+			continue
+		}
+
+		prefix, err := netip.ParsePrefix(strings.TrimPrefix(line, "allowed_ip="))
+		if err != nil {
+			log.Warnf("failed to parse allowed IP %q: %v", line, err)
+			continue
+		}
+		prefixes = append(prefixes, prefix)
+	}
+	return prefixes, nil
+}
+
 func (c *WGUSPConfigurer) AddAllowedIP(peerKey string, allowedIP netip.Prefix) error {
 	ipNet := net.IPNet{
 		IP:   allowedIP.Addr().AsSlice(),
diff --git a/client/iface/configurer/usp_idle_test.go b/client/iface/configurer/usp_idle_test.go
new file mode 100644
index 000000000..6ed1dbc9a
--- /dev/null
+++ b/client/iface/configurer/usp_idle_test.go
@@ -0,0 +1,158 @@
+package configurer
+
+import (
+	"encoding/hex"
+	"net"
+	"net/netip"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	wgconn "golang.zx2c4.com/wireguard/conn"
+	"golang.zx2c4.com/wireguard/device"
+	"golang.zx2c4.com/wireguard/tun/netstack"
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+
+	"github.com/netbirdio/netbird/client/iface/bind"
+)
+
+// newTestConfigurer creates a configurer backed by an in-memory wireguard-go device.
+func newTestConfigurer(t *testing.T) *WGUSPConfigurer {
+	t.Helper()
+
+	tunDev, _, err := netstack.CreateNetTUN([]netip.Addr{netip.MustParseAddr("100.64.0.1")}, []netip.Addr{}, 1280)
+	require.NoError(t, err)
+
+	wgDev := device.NewDevice(tunDev, wgconn.NewDefaultBind(), device.NewLogger(device.LogLevelSilent, "[test] "))
+	t.Cleanup(wgDev.Close)
+
+	c := NewUSPConfigurerNoUAPI(wgDev, "utun-test", bind.NewActivityRecorder())
+
+	key, err := wgtypes.GeneratePrivateKey()
+	require.NoError(t, err)
+	require.NoError(t, c.ConfigureInterface(key.String(), 0))
+
+	return c
+}
+
+// peerAllowedIPs returns the allowed IPs currently installed for the given peer.
+func peerAllowedIPs(t *testing.T, c *WGUSPConfigurer, pubKey string) []string {
+	t.Helper()
+
+	var ips []string
+	for _, line := range peerIpcLines(t, c, pubKey) {
+		if strings.HasPrefix(line, "allowed_ip=") {
+			ips = append(ips, strings.TrimPrefix(line, "allowed_ip="))
+		}
+	}
+	return ips
+}
+
+// peerEndpoint returns the endpoint currently installed for the given peer.
+func peerEndpoint(t *testing.T, c *WGUSPConfigurer, pubKey string) string {
+	t.Helper()
+
+	for _, line := range peerIpcLines(t, c, pubKey) {
+		if strings.HasPrefix(line, "endpoint=") {
+			return strings.TrimPrefix(line, "endpoint=")
+		}
+	}
+	return ""
+}
+
+// peerIpcLines returns the uapi config lines belonging to the given peer.
+func peerIpcLines(t *testing.T, c *WGUSPConfigurer, pubKey string) []string {
+	t.Helper()
+
+	key, err := wgtypes.ParseKey(pubKey)
+	require.NoError(t, err)
+	hexKey := hex.EncodeToString(key[:])
+
+	ipc, err := c.device.IpcGet()
+	require.NoError(t, err)
+
+	var lines []string
+	inPeer := false
+	for _, line := range strings.Split(ipc, "\n") {
+		line = strings.TrimSpace(line)
+		if strings.HasPrefix(line, "public_key=") {
+			inPeer = line == "public_key="+hexKey
+			continue
+		}
+		if inPeer && line != "" {
+			lines = append(lines, line)
+		}
+	}
+	return lines
+}
+
+// TestUSPConfigurer_IdlePeerEndpointPreservesAllowedIPs verifies the invariant the lazy idle
+// transition relies on: IdlePeerEndpoint re-creates the peer (dropping handshake state via the
+// remove+add transaction) while keeping every installed allowed IP, including routed
+// prefixes added later by the route manager, and points the endpoint at the wake listener.
+func TestUSPConfigurer_IdlePeerEndpointPreservesAllowedIPs(t *testing.T) {
+	c := newTestConfigurer(t)
+
+	peerKey, err := wgtypes.GeneratePrivateKey()
+	require.NoError(t, err)
+	pubKey := peerKey.PublicKey().String()
+
+	overlay := netip.MustParsePrefix("100.64.0.5/32")
+	routed := netip.MustParsePrefix("10.99.0.0/24")
+
+	realEndpoint := &net.UDPAddr{IP: net.ParseIP("127.0.0.1"), Port: 51821}
+	require.NoError(t, c.UpdatePeer(pubKey, []netip.Prefix{overlay}, 25*time.Second, realEndpoint, nil))
+	require.NoError(t, c.AddAllowedIP(pubKey, routed))
+
+	ips := peerAllowedIPs(t, c, pubKey)
+	require.Contains(t, ips, overlay.String(), "overlay prefix must be installed before the idle endpoint swap")
+	require.Contains(t, ips, routed.String(), "routed prefix must be installed before the idle endpoint swap")
+
+	wakeEndpoint := &net.UDPAddr{IP: net.ParseIP("127.2.0.5"), Port: 17473}
+	require.NoError(t, c.IdlePeerEndpoint(pubKey, []netip.Prefix{overlay}, wakeEndpoint))
+
+	ips = peerAllowedIPs(t, c, pubKey)
+	assert.Contains(t, ips, routed.String(), "routed prefix must survive the idle endpoint swap")
+	assert.Contains(t, ips, overlay.String(), "overlay prefix must survive the idle endpoint swap")
+	assert.Equal(t, "127.2.0.5:17473", peerEndpoint(t, c, pubKey), "endpoint must point at the wake listener after the idle endpoint swap")
+}
+
+// TestUSPConfigurer_IdlePeerEndpointCreatesMissingPeer verifies the cold-start arm path: when the
+// peer does not exist yet (never connected), IdlePeerEndpoint creates it with the given base
+// allowed IPs and the wake endpoint.
+func TestUSPConfigurer_IdlePeerEndpointCreatesMissingPeer(t *testing.T) {
+	c := newTestConfigurer(t)
+
+	peerKey, err := wgtypes.GeneratePrivateKey()
+	require.NoError(t, err)
+	pubKey := peerKey.PublicKey().String()
+
+	overlay := netip.MustParsePrefix("100.64.0.5/32")
+	wakeEndpoint := &net.UDPAddr{IP: net.ParseIP("127.2.0.5"), Port: 17473}
+
+	require.NoError(t, c.IdlePeerEndpoint(pubKey, []netip.Prefix{overlay}, wakeEndpoint))
+
+	assert.Equal(t, []string{overlay.String()}, peerAllowedIPs(t, c, pubKey), "missing peer must be created with the base allowed IPs")
+	assert.Equal(t, "127.2.0.5:17473", peerEndpoint(t, c, pubKey), "missing peer must be created with the wake endpoint")
+}
+
+// TestUSPConfigurer_AddAllowedIPOnMissingPeerIsSilentNoOp documents the wireguard-go
+// behavior the removed-peer idle flow raced against: AddAllowedIP uses update_only,
+// which is a silent no-op when the peer does not exist. The idle transition must
+// therefore keep the WireGuard peer (Conn.Idle + IdlePeerEndpoint) instead of leaving a
+// window where the peer is absent.
+func TestUSPConfigurer_AddAllowedIPOnMissingPeerIsSilentNoOp(t *testing.T) {
+	c := newTestConfigurer(t)
+
+	peerKey, err := wgtypes.GeneratePrivateKey()
+	require.NoError(t, err)
+	pubKey := peerKey.PublicKey().String()
+
+	routed := netip.MustParsePrefix("10.99.0.0/24")
+
+	require.NoError(t, c.AddAllowedIP(pubKey, routed), "update-only on a missing peer must not return an error")
+
+	assert.Empty(t, peerIpcLines(t, c, pubKey), "update-only call must not create the peer")
+}
diff --git a/client/iface/device/interface.go b/client/iface/device/interface.go
index 7bab7b757..4861662a9 100644
--- a/client/iface/device/interface.go
+++ b/client/iface/device/interface.go
@@ -15,6 +15,7 @@ type WGConfigurer interface {
 	ConfigureInterface(privateKey string, port int) error
 	UpdatePeer(peerKey string, allowedIps []netip.Prefix, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error
 	RemovePeer(peerKey string) error
+	IdlePeerEndpoint(peerKey string, allowedIPs []netip.Prefix, endpoint *net.UDPAddr) error
 	AddAllowedIP(peerKey string, allowedIP netip.Prefix) error
 	RemoveAllowedIP(peerKey string, allowedIP netip.Prefix) error
 	SetPresharedKey(peerKey string, psk wgtypes.Key, updateOnly bool) error
diff --git a/client/iface/iface.go b/client/iface/iface.go
index 247f421a2..0381531b3 100644
--- a/client/iface/iface.go
+++ b/client/iface/iface.go
@@ -184,6 +184,19 @@ func (w *WGIface) RemovePeer(peerKey string) error {
 	return w.configurer.RemovePeer(peerKey)
 }
 
+// IdlePeerEndpoint re-creates the peer pointing at the lazy wake endpoint, dropping
+// handshake state while preserving the peer's currently installed allowed IPs.
+func (w *WGIface) IdlePeerEndpoint(peerKey string, allowedIPs []netip.Prefix, endpoint *net.UDPAddr) error {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	if w.configurer == nil {
+		return ErrIfaceNotFound
+	}
+
+	log.Debugf("Resetting peer on interface %s: %s, endpoint %s", w.tun.DeviceName(), peerKey, endpoint)
+	return w.configurer.IdlePeerEndpoint(peerKey, allowedIPs, endpoint)
+}
+
 // AddAllowedIP adds a prefix to the allowed IPs list of peer
 func (w *WGIface) AddAllowedIP(peerKey string, allowedIP netip.Prefix) error {
 	w.mu.Lock()
diff --git a/client/internal/conn_mgr.go b/client/internal/conn_mgr.go
index 77d1e6ca5..e1df336f8 100644
--- a/client/internal/conn_mgr.go
+++ b/client/internal/conn_mgr.go
@@ -228,7 +228,7 @@ func (e *ConnMgr) RemovePeerConn(peerKey string) {
 	if !ok {
 		return
 	}
-	defer conn.Close(false)
+	defer conn.Close()
 
 	if !e.isStartedWithLazyMgr() {
 		return
diff --git a/client/internal/engine.go b/client/internal/engine.go
index 1d00ed0d2..f689dd2a6 100644
--- a/client/internal/engine.go
+++ b/client/internal/engine.go
@@ -1778,7 +1778,7 @@ func (e *Engine) addNewPeer(peerConfig *mgmProto.RemotePeerConfig) error {
 	}
 
 	if exists := e.connMgr.AddPeerConn(e.ctx, peerKey, conn); exists {
-		conn.Close(false)
+		conn.Close()
 		return fmt.Errorf("peer already exists: %s", peerKey)
 	}
 
diff --git a/client/internal/engine_test.go b/client/internal/engine_test.go
index fbd47ed74..2989033e4 100644
--- a/client/internal/engine_test.go
+++ b/client/internal/engine_test.go
@@ -53,6 +53,7 @@ type MockWGIface struct {
 	UpdateAddrFunc             func(newAddr wgaddr.Address) error
 	UpdatePeerFunc             func(peerKey string, allowedIps []netip.Prefix, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error
 	RemovePeerFunc             func(peerKey string) error
+	IdlePeerEndpointFunc       func(peerKey string, allowedIPs []netip.Prefix, endpoint *net.UDPAddr) error
 	AddAllowedIPFunc           func(peerKey string, allowedIP netip.Prefix) error
 	RemoveAllowedIPFunc        func(peerKey string, allowedIP netip.Prefix) error
 	CloseFunc                  func() error
@@ -124,6 +125,13 @@ func (m *MockWGIface) RemovePeer(peerKey string) error {
 	return m.RemovePeerFunc(peerKey)
 }
 
+func (m *MockWGIface) IdlePeerEndpoint(peerKey string, allowedIPs []netip.Prefix, endpoint *net.UDPAddr) error {
+	if m.IdlePeerEndpointFunc == nil {
+		return nil
+	}
+	return m.IdlePeerEndpointFunc(peerKey, allowedIPs, endpoint)
+}
+
 func (m *MockWGIface) AddAllowedIP(peerKey string, allowedIP netip.Prefix) error {
 	return m.AddAllowedIPFunc(peerKey, allowedIP)
 }
diff --git a/client/internal/iface_common.go b/client/internal/iface_common.go
index 8ffa0b102..1d4d87832 100644
--- a/client/internal/iface_common.go
+++ b/client/internal/iface_common.go
@@ -32,6 +32,7 @@ type wgIfaceBase interface {
 	UpdatePeer(peerKey string, allowedIps []netip.Prefix, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error
 	RemoveEndpointAddress(key string) error
 	RemovePeer(peerKey string) error
+	IdlePeerEndpoint(peerKey string, allowedIPs []netip.Prefix, endpoint *net.UDPAddr) error
 	AddAllowedIP(peerKey string, allowedIP netip.Prefix) error
 	RemoveAllowedIP(peerKey string, allowedIP netip.Prefix) error
 	Close() error
diff --git a/client/internal/lazyconn/activity/listener_bind.go b/client/internal/lazyconn/activity/listener_bind.go
index 72a0cfc76..942e1fa84 100644
--- a/client/internal/lazyconn/activity/listener_bind.go
+++ b/client/internal/lazyconn/activity/listener_bind.go
@@ -106,7 +106,7 @@ func (d *BindListener) setupLazyConn() error {
 		IP:   d.fakeIP.AsSlice(),
 		Port: lazyBindPort,
 	}
-	return d.wgIface.UpdatePeer(d.peerCfg.PublicKey, d.peerCfg.AllowedIPs, 0, endpoint, nil)
+	return d.wgIface.IdlePeerEndpoint(d.peerCfg.PublicKey, d.peerCfg.AllowedIPs, endpoint)
 }
 
 // ReadPackets blocks until activity is detected on the LazyConn or the listener is closed.
diff --git a/client/internal/lazyconn/activity/listener_bind_test.go b/client/internal/lazyconn/activity/listener_bind_test.go
index 7026a9c97..f56b752c9 100644
--- a/client/internal/lazyconn/activity/listener_bind_test.go
+++ b/client/internal/lazyconn/activity/listener_bind_test.go
@@ -9,7 +9,6 @@ import (
 	log "github.com/sirupsen/logrus"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 
 	"github.com/netbirdio/netbird/client/iface/device"
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
@@ -45,7 +44,7 @@ type MockWGIfaceBind struct {
 	endpointMgr *mockEndpointManager
 }
 
-func (m *MockWGIfaceBind) UpdatePeer(string, []netip.Prefix, time.Duration, *net.UDPAddr, *wgtypes.Key) error {
+func (m *MockWGIfaceBind) IdlePeerEndpoint(string, []netip.Prefix, *net.UDPAddr) error {
 	return nil
 }
 
diff --git a/client/internal/lazyconn/activity/listener_udp.go b/client/internal/lazyconn/activity/listener_udp.go
index 4b7e0ddf7..bda14e89a 100644
--- a/client/internal/lazyconn/activity/listener_udp.go
+++ b/client/internal/lazyconn/activity/listener_udp.go
@@ -101,7 +101,7 @@ func (d *UDPListener) Close() {
 
 func (d *UDPListener) createEndpoint() error {
 	d.peerCfg.Log.Debugf("creating lazy endpoint: %s", d.endpoint.String())
-	return d.wgIface.UpdatePeer(d.peerCfg.PublicKey, d.peerCfg.AllowedIPs, 0, d.endpoint, nil)
+	return d.wgIface.IdlePeerEndpoint(d.peerCfg.PublicKey, d.peerCfg.AllowedIPs, d.endpoint)
 }
 
 func (d *UDPListener) newConn() (*net.UDPConn, error) {
diff --git a/client/internal/lazyconn/activity/manager.go b/client/internal/lazyconn/activity/manager.go
index 9de8c0fa7..4666f689f 100644
--- a/client/internal/lazyconn/activity/manager.go
+++ b/client/internal/lazyconn/activity/manager.go
@@ -5,10 +5,8 @@ import (
 	"net"
 	"net/netip"
 	"sync"
-	"time"
 
 	log "github.com/sirupsen/logrus"
-	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/client/internal/lazyconn"
@@ -30,7 +28,7 @@ type Event struct {
 }
 
 type WgInterface interface {
-	UpdatePeer(peerKey string, allowedIps []netip.Prefix, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error
+	IdlePeerEndpoint(peerKey string, allowedIPs []netip.Prefix, endpoint *net.UDPAddr) error
 	IsUserspaceBind() bool
 	Address() wgaddr.Address
 	MTU() uint16
diff --git a/client/internal/lazyconn/activity/manager_test.go b/client/internal/lazyconn/activity/manager_test.go
index 07dd8d84c..c8416a257 100644
--- a/client/internal/lazyconn/activity/manager_test.go
+++ b/client/internal/lazyconn/activity/manager_test.go
@@ -8,7 +8,6 @@ import (
 	"time"
 
 	log "github.com/sirupsen/logrus"
-	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/client/internal/lazyconn"
@@ -26,7 +25,7 @@ func (m *MocPeer) ConnID() peerid.ConnID {
 type MocWGIface struct {
 }
 
-func (m MocWGIface) UpdatePeer(string, []netip.Prefix, time.Duration, *net.UDPAddr, *wgtypes.Key) error {
+func (m MocWGIface) IdlePeerEndpoint(string, []netip.Prefix, *net.UDPAddr) error {
 	return nil
 }
 
diff --git a/client/internal/lazyconn/manager/manager.go b/client/internal/lazyconn/manager/manager.go
index 3868e37e8..5808260cf 100644
--- a/client/internal/lazyconn/manager/manager.go
+++ b/client/internal/lazyconn/manager/manager.go
@@ -280,7 +280,7 @@ func (m *Manager) DeactivatePeer(peerID peerid.ConnID) {
 		return
 	}
 
-	m.peerStore.PeerConnClose(mp.peerCfg.PublicKey)
+	m.peerStore.PeerConnIdle(mp.peerCfg.PublicKey, false)
 
 	mp.peerCfg.Log.Infof("start activity monitor")
 
@@ -569,7 +569,7 @@ func (m *Manager) onPeerInactivityTimedOut(peerIDs map[string]struct{}) {
 		mp.peerCfg.Log.Infof("connection timed out")
 
 		// this is blocking operation, potentially can be optimized
-		m.peerStore.PeerConnIdle(mp.peerCfg.PublicKey)
+		m.peerStore.PeerConnIdle(mp.peerCfg.PublicKey, true)
 
 		mp.expectedWatcher = watcherActivity
 
diff --git a/client/internal/lazyconn/wgiface.go b/client/internal/lazyconn/wgiface.go
index f003ab3cf..bfdef6dd4 100644
--- a/client/internal/lazyconn/wgiface.go
+++ b/client/internal/lazyconn/wgiface.go
@@ -3,9 +3,6 @@ package lazyconn
 import (
 	"net"
 	"net/netip"
-	"time"
-
-	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/monotime"
@@ -13,7 +10,7 @@ import (
 
 type WGIface interface {
 	RemovePeer(peerKey string) error
-	UpdatePeer(peerKey string, allowedIps []netip.Prefix, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error
+	IdlePeerEndpoint(peerKey string, allowedIPs []netip.Prefix, endpoint *net.UDPAddr) error
 	IsUserspaceBind() bool
 	Address() wgaddr.Address
 	LastActivities() map[string]monotime.Time
diff --git a/client/internal/peer/conn.go b/client/internal/peer/conn.go
index 09a4e8b02..9e7b1de13 100644
--- a/client/internal/peer/conn.go
+++ b/client/internal/peer/conn.go
@@ -285,8 +285,20 @@ func (conn *Conn) open(engineCtx context.Context, firstPacket []byte) error {
 	return nil
 }
 
-// Close closes this peer Conn issuing a close event to the Conn closeCh
-func (conn *Conn) Close(signalToRemote bool) {
+// Close closes this peer Conn issuing a close event to the Conn closeCh and removes the WireGuard peer
+func (conn *Conn) Close() {
+	conn.close(false, true)
+}
+
+// Idle tears down the connection for the lazy idle state: transports and proxies are
+// closed but the WireGuard peer is kept, so its AllowedIPs (including routed prefixes
+// installed by the route manager) survive until the activity listener re-points the
+// endpoint at the wake listener.
+func (conn *Conn) Idle(signalToRemote bool) {
+	conn.close(signalToRemote, false)
+}
+
+func (conn *Conn) close(signalToRemote bool, removeWgPeer bool) {
 	conn.mu.Lock()
 	defer conn.wgWatcherWg.Wait()
 	defer conn.mu.Unlock()
@@ -329,8 +341,12 @@ func (conn *Conn) Close(signalToRemote bool) {
 		conn.wgProxyICE = nil
 	}
 
-	if err := conn.endpointUpdater.RemoveWgPeer(); err != nil {
-		conn.Log.Errorf("failed to remove wg endpoint: %v", err)
+	if removeWgPeer {
+		if err := conn.endpointUpdater.RemoveWgPeer(); err != nil {
+			conn.Log.Errorf("failed to remove wg endpoint: %v", err)
+		}
+	} else {
+		conn.endpointUpdater.CancelPendingUpdates()
 	}
 
 	if conn.evalStatus() == StatusConnected && conn.onDisconnected != nil {
diff --git a/client/internal/peer/endpoint.go b/client/internal/peer/endpoint.go
index 9ba1efb6e..424b72d73 100644
--- a/client/internal/peer/endpoint.go
+++ b/client/internal/peer/endpoint.go
@@ -65,6 +65,16 @@ func (e *EndpointUpdater) RemoveWgPeer() error {
 	return e.wgConfig.WgInterface.RemovePeer(e.wgConfig.RemoteKey)
 }
 
+// CancelPendingUpdates stops a scheduled delayed endpoint update without touching the
+// WireGuard peer. Used on the idle transition where the peer is kept so a pending
+// responder-side update cannot overwrite the wake endpoint later.
+func (e *EndpointUpdater) CancelPendingUpdates() {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	e.waitForCloseTheDelayedUpdate()
+}
+
 func (e *EndpointUpdater) RemoveEndpointAddress() error {
 	e.mu.Lock()
 	defer e.mu.Unlock()
diff --git a/client/internal/peer/endpoint_test.go b/client/internal/peer/endpoint_test.go
new file mode 100644
index 000000000..f1affe88c
--- /dev/null
+++ b/client/internal/peer/endpoint_test.go
@@ -0,0 +1,99 @@
+package peer
+
+import (
+	"net"
+	"net/netip"
+	"sync"
+	"testing"
+	"time"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+
+	"github.com/netbirdio/netbird/client/iface/configurer"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
+	"github.com/netbirdio/netbird/client/iface/wgproxy"
+)
+
+type endpointTestWGIface struct {
+	mu          sync.Mutex
+	updateCalls int
+	removeCalls int
+}
+
+func (m *endpointTestWGIface) UpdatePeer(string, []netip.Prefix, time.Duration, *net.UDPAddr, *wgtypes.Key) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.updateCalls++
+	return nil
+}
+
+func (m *endpointTestWGIface) RemovePeer(string) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.removeCalls++
+	return nil
+}
+
+func (m *endpointTestWGIface) GetStats() (map[string]configurer.WGStats, error) { return nil, nil }
+
+func (m *endpointTestWGIface) GetProxy() wgproxy.Proxy { return nil }
+
+func (m *endpointTestWGIface) Address() wgaddr.Address { return wgaddr.Address{} }
+
+func (m *endpointTestWGIface) RemoveEndpointAddress(string) error { return nil }
+
+func (m *endpointTestWGIface) counts() (updates, removes int) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	return m.updateCalls, m.removeCalls
+}
+
+func newTestEndpointUpdater(iface *endpointTestWGIface, initiator bool) *EndpointUpdater {
+	cfg := WgConfig{
+		RemoteKey:   "remoteKey",
+		WgInterface: iface,
+		AllowedIps:  []netip.Prefix{netip.MustParsePrefix("100.64.0.5/32")},
+	}
+	return NewEndpointUpdater(log.WithField("peer", "test"), cfg, initiator)
+}
+
+// TestEndpointUpdater_CancelPendingUpdates ensures a scheduled responder-side delayed
+// update is stopped without removing the WireGuard peer, so an idle transition cannot
+// be overwritten later by a stale endpoint update.
+func TestEndpointUpdater_CancelPendingUpdates(t *testing.T) {
+	iface := &endpointTestWGIface{}
+	e := newTestEndpointUpdater(iface, false)
+
+	addr := &net.UDPAddr{IP: net.ParseIP("127.0.0.1"), Port: 51820}
+	require.NoError(t, e.ConfigureWGEndpoint(addr, nil))
+
+	updates, _ := iface.counts()
+	require.Equal(t, 1, updates, "responder must apply the immediate nil-endpoint update")
+
+	// CancelPendingUpdates waits for the delayed-update goroutine to exit, so the
+	// call counts below are final: the 5s fallback update can never fire anymore.
+	e.CancelPendingUpdates()
+
+	updates, removes := iface.counts()
+	assert.Equal(t, 1, updates, "delayed endpoint update must not fire after cancellation")
+	assert.Equal(t, 0, removes, "cancellation must not remove the WireGuard peer")
+}
+
+// TestEndpointUpdater_CancelPendingUpdatesNoPending ensures cancellation is a safe no-op
+// when no delayed update is scheduled (initiator path).
+func TestEndpointUpdater_CancelPendingUpdatesNoPending(t *testing.T) {
+	iface := &endpointTestWGIface{}
+	e := newTestEndpointUpdater(iface, true)
+
+	addr := &net.UDPAddr{IP: net.ParseIP("127.0.0.1"), Port: 51820}
+	require.NoError(t, e.ConfigureWGEndpoint(addr, nil))
+
+	e.CancelPendingUpdates()
+
+	updates, removes := iface.counts()
+	assert.Equal(t, 1, updates, "initiator applies exactly one direct update")
+	assert.Equal(t, 0, removes, "cancellation must not remove the WireGuard peer")
+}
diff --git a/client/internal/peerstore/store.go b/client/internal/peerstore/store.go
index 112caa101..b9745ffd8 100644
--- a/client/internal/peerstore/store.go
+++ b/client/internal/peerstore/store.go
@@ -108,7 +108,10 @@ func (s *Store) PeerConnOpenWithFirstPacket(ctx context.Context, pubKey string,
 	}
 }
 
-func (s *Store) PeerConnIdle(pubKey string) {
+// PeerConnIdle transitions the peer connection to the lazy idle state, keeping the
+// WireGuard peer and its AllowedIPs in place. signalToRemote indicates whether the
+// remote peer should be notified (false when the remote initiated the idle via GOAWAY).
+func (s *Store) PeerConnIdle(pubKey string, signalToRemote bool) {
 	s.peerConnsMu.RLock()
 	defer s.peerConnsMu.RUnlock()
 
@@ -116,18 +119,7 @@ func (s *Store) PeerConnIdle(pubKey string) {
 	if !ok {
 		return
 	}
-	p.Close(true)
-}
-
-func (s *Store) PeerConnClose(pubKey string) {
-	s.peerConnsMu.RLock()
-	defer s.peerConnsMu.RUnlock()
-
-	p, ok := s.peerConns[pubKey]
-	if !ok {
-		return
-	}
-	p.Close(false)
+	p.Idle(signalToRemote)
 }
 
 func (s *Store) PeersPubKey() []string {