diff --git a/main.go b/main.go
index 18c8dd6..d5f139b 100644
--- a/main.go
+++ b/main.go
@@ -129,6 +129,11 @@ func handler(w http.ResponseWriter, r *http.Request) {
 		D = make(map[string]dns_entry)
 	}
 
+	if strings.Contains(Ip6, ".") {
+		WriteLog("!", "IPv6 nicht möglich (IP-Version-Mismatch):", Ip6, "eventuell eine IPv4-Adresse?")
+		Ip6 = ""
+	}
+
 	if strings.EqualFold(Dns, "") || strings.EqualFold(Ip, "") || strings.EqualFold(User, "") || strings.EqualFold(Token, "") {
 		/* strings.ToLower(Dns) != strings.ToLower("") && strings.ToLower(Ip) != strings.ToLower("") && strings.ToLower(User) != strings.ToLower("") && strings.ToLower(Token) != strings.ToLower("")*/
 		WriteLog("!", "Eintrag unvollständig: ", D[Dns])
@@ -307,14 +312,14 @@ func handleDNSRequest(w dns.ResponseWriter, r *dns.Msg) {
 
 func prepareExit() {
 	WriteLog("~", "Running exit tasks...")
-
-	WriteLog("~", "Exit completed.")
+	os.Rename("/data/error.log", "/data/error_"+time.Now().Format("2006-01-02_15-04-05")+".log")
+	fmt.Println("~", "Exit completed.")
 }
 
 func StopServer(e error) {
 	WriteLog("~", "Stopping server...")
 	prepareExit()
-	WriteLog("~", "Server stopped!")
+	fmt.Println("~", "Server stopped!")
 }
 
 func main() {