diff --git a/src/netcode/i_tcp.c b/src/netcode/i_tcp.c
index 50e614fbb..9a261fb4e 100644
--- a/src/netcode/i_tcp.c
+++ b/src/netcode/i_tcp.c
@@ -1,7 +1,7 @@
 // SONIC ROBO BLAST 2
 //-----------------------------------------------------------------------------
 // Copyright (C) 1998-2000 by DooM Legacy Team.
-// Copyright (C) 1999-2024 by Sonic Team Junior.
+// Copyright (C) 1999-2025 by Sonic Team Junior.
 //
 // This program is free software distributed under the
 // terms of the GNU General Public License, version 2.
@@ -386,6 +386,7 @@ static const char *SOCK_AddrToStr(mysockaddr_t *sk)
 	int v6 = 0;
 #endif
 	void *addr;
+	int e = 0; // save error code so it can't be modified later code and avoid calling WSAGetLastError() more then once
 
 	if(sk->any.sa_family == AF_INET)
 		addr = &sk->ip4.sin_addr;
@@ -399,7 +400,10 @@ static const char *SOCK_AddrToStr(mysockaddr_t *sk)
 	if(addr == NULL)
 		sprintf(s, "No address");
 	else if(inet_ntop(sk->any.sa_family, addr, &s[v6], sizeof (s) - v6) == NULL)
-		sprintf(s, "Unknown family type, error #%u", errno);
+	{
+		e = errno;
+		sprintf(s, "Unknown family type, error #%u: %s", e, strerror(e));
+	}
 #ifdef HAVE_IPV6
 	else if(sk->any.sa_family == AF_INET6)
 	{
@@ -657,7 +661,7 @@ static inline ssize_t SOCK_SendToAddr(SOCKET_TYPE socket, mysockaddr_t *sockaddr
 static void SOCK_Send(void)
 {
 	ssize_t c = ERRSOCKET;
-	int e = -1; // save error code so it can't be modified later code and avoid calling WSAGetLastError() more then once
+	int e = 0; // save error code so it can't be modified later code and avoid calling WSAGetLastError() more then once
 
 	if (!nodeconnected[doomcom->remotenode])
 		return;
@@ -709,7 +713,7 @@ static void SOCK_Send(void)
 	if (c == ERRSOCKET && e != -1) // -1 means no socket for the address family was found
 	{
 		if (!ALLOWEDERROR(e))
-			I_Error("SOCK_Send, error sending to node %d (%s) #%u: %s", doomcom->remotenode,
+			I_Error("SOCK_Send, error sending to node %d (%s) #%u, %s", doomcom->remotenode,
 				SOCK_GetNodeAddress(doomcom->remotenode), e, strerror(e));
 	}
 }
@@ -740,6 +744,8 @@ static SOCKET_TYPE UDP_Bind(int family, struct sockaddr *addr, socklen_t addrlen
 {
 	SOCKET_TYPE s = socket(family, SOCK_DGRAM, IPPROTO_UDP);
 	int opt;
+	int rc;
+	int e = 0; // save error code so it can't be modified later code and avoid calling WSAGetLastError() more then once
 	socklen_t opts;
 #ifdef FIONBIO
 	unsigned long trueval = true;
@@ -754,12 +760,17 @@ static SOCKET_TYPE UDP_Bind(int family, struct sockaddr *addr, socklen_t addrlen
 #ifdef USE_WINSOCK2
 		DWORD dwBytesReturned = 0;
 		BOOL bfalse = FALSE;
-		WSAIoctl(s, SIO_UDP_CONNRESET, &bfalse, sizeof(bfalse),
+		rc = WSAIoctl(s, SIO_UDP_CONNRESET, &bfalse, sizeof(bfalse),
 		         NULL, 0, &dwBytesReturned, NULL, NULL);
 #else
 		unsigned long falseval = false;
-		ioctl(s, SIO_UDP_CONNRESET, &falseval);
+		rc = ioctl(s, SIO_UDP_CONNRESET, &falseval);
 #endif
+		if (rc == -1)
+		{
+			e = errno;
+			I_OutputMsg("SIO_UDP_CONNRESET failed: #%u, %s\n", e, strerror(e));
+		}
 	}
 #endif
 
@@ -772,14 +783,22 @@ static SOCKET_TYPE UDP_Bind(int family, struct sockaddr *addr, socklen_t addrlen
 		{
 			opt = true;
 			opts = (socklen_t)sizeof(opt);
-			setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&opt, opts);
+			rc = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&opt, opts);
+			if (rc <= -1)
+			{
+				e = errno;
+				I_OutputMsg("setting SO_REUSEADDR failed: #%u, %s\n", e, strerror(e));
+			}
 		}
 		// make it broadcastable
 		opt = true;
 		opts = (socklen_t)sizeof(opt);
-		if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, (char *)&opt, opts))
+		rc = setsockopt(s, SOL_SOCKET, SO_BROADCAST, (char *)&opt, opts);
+		if (rc <= -1)
 		{
+			e = errno;
 			CONS_Alert(CONS_WARNING, M_GetText("Could not get broadcast rights\n")); // I do not care anymore
+			I_OutputMsg("setting SO_BROADCAST failed: #%u, %s\n", e, strerror(e));
 		}
 	}
 #ifdef HAVE_IPV6
@@ -789,24 +808,34 @@ static SOCKET_TYPE UDP_Bind(int family, struct sockaddr *addr, socklen_t addrlen
 		{
 			opt = true;
 			opts = (socklen_t)sizeof(opt);
-			setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&opt, opts);
+			rc = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&opt, opts);
+			if (rc <= -1)
+			{
+				e = errno;
+				I_OutputMsg("setting SO_REUSEADDR failed: #%u, %s\n", e, strerror(e));
+			}
 		}
 #ifdef IPV6_V6ONLY
 		// make it IPv6 ony
 		opt = true;
 		opts = (socklen_t)sizeof(opt);
-		if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&opt, opts))
+		rc = setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&opt, opts);
+		if (rc <= -1)
 		{
+			e = errno;
 			CONS_Alert(CONS_WARNING, M_GetText("Could not limit IPv6 bind\n")); // I do not care anymore
+			I_OutputMsg("setting IPV6_V6ONLY failed: #%u, %s\n", e, strerror(e));
 		}
 #endif
 	}
 #endif
 
-	if (bind(s, addr, addrlen) == ERRSOCKET)
+	rc = bind(s, addr, addrlen);
+	if (rc == ERRSOCKET)
 	{
+		e = errno;
 		close(s);
-		I_OutputMsg("Binding failed\n");
+		I_OutputMsg("Binding failed: #%u, %s\n", e, strerror(e));
 		return (SOCKET_TYPE)ERRSOCKET;
 	}
 
@@ -820,9 +849,18 @@ static SOCKET_TYPE UDP_Bind(int family, struct sockaddr *addr, socklen_t addrlen
 
 			inet_pton(AF_INET6, IPV6_MULTICAST_ADDRESS, &maddr.ipv6mr_multiaddr);
 			maddr.ipv6mr_interface = 0;
-			if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, (const char *)&maddr, sizeof(maddr)) != 0)
+			rc = setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, (const char *)&maddr, sizeof(maddr));
+			if (rc <= -1)
 			{
+				e = errno;
 				CONS_Alert(CONS_WARNING, M_GetText("Could not register multicast address\n"));
+				if (e == ENODEV)
+				{
+					close(s);
+					I_OutputMsg("Binding failed: no IPv6 device\n");
+					return (SOCKET_TYPE)ERRSOCKET;
+				}
+				I_OutputMsg("setting IPV6_JOIN_GROUP failed: #%u, %s \n", e, strerror(e));
 			}
 		}
 	}
@@ -830,33 +868,56 @@ static SOCKET_TYPE UDP_Bind(int family, struct sockaddr *addr, socklen_t addrlen
 
 #ifdef FIONBIO
 	// make it non blocking
-	opt = true;
-	if (ioctl(s, FIONBIO, &trueval) != 0)
+	rc = ioctl(s, FIONBIO, &trueval);
+	if (rc == -1)
 	{
+		e = errno;
 		close(s);
-		I_OutputMsg("Seting FIOBIO on failed\n");
+		I_OutputMsg("FIOBIO failed: #%u, %s\n", e, strerror(e));
 		return (SOCKET_TYPE)ERRSOCKET;
 	}
 #endif
 
+	opt = 0;
 	opts = (socklen_t)sizeof(opt);
-	getsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&opt, &opts);
+	rc = getsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&opt, &opts);
+	if (rc <= -1)
+	{
+		e = errno;
+		I_OutputMsg("getting SO_RCVBUF failed: #%u, %s\n", e, strerror(e));
+	}
 	CONS_Printf(M_GetText("Network system buffer: %dKb\n"), opt>>10);
 
 	if (opt < 64<<10) // 64k
 	{
 		opt = 64<<10;
 		opts = (socklen_t)sizeof(opt);
-		setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&opt, opts);
-		getsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&opt, &opts);
-		if (opt < 64<<10)
+		rc = setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&opt, opts);
+		if (rc <= -1)
+		{
+			e = errno;
+			I_OutputMsg("setting SO_RCVBUF failed: #%u, %s\n", e, strerror(e));
+		}
+		opt = 0;
+		rc = getsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&opt, &opts);
+		if (rc <= -1)
+		{
+			e = errno;
+			I_OutputMsg("getting SO_RCVBUF failed: #%u, %s\n", e, strerror(e));
+		}
+		if (opt <= 64<<10)
 			CONS_Alert(CONS_WARNING, M_GetText("Can't set buffer length to 64k, file transfer will be bad\n"));
 		else
 			CONS_Printf(M_GetText("Network system buffer set to: %dKb\n"), opt>>10);
 	}
 
-	if (getsockname(s, &straddr.any, &len) == -1)
+	rc = getsockname(s, &straddr.any, &len);
+	if (rc != 0)
+	{
+		e = errno;
 		CONS_Alert(CONS_WARNING, M_GetText("Failed to get port number\n"));
+		I_OutputMsg("getsockname failed: #%u, %s\n", e, strerror(e));
+	}
 	else
 	{
 		if (family == AF_INET)
@@ -894,6 +955,13 @@ static boolean UDP_Socket(void)
 	hints.ai_socktype = SOCK_DGRAM;
 	hints.ai_protocol = IPPROTO_UDP;
 
+#ifdef HAVE_IPV6
+	if (!b_ipv6)
+		I_OutputMsg("Disabling IPv6 support at runtime\n");
+#else
+	I_OutputMsg("Compiled without IPv6 support\n");
+#endif
+
 	if (serverrunning)
 		serv = serverport_name;
 	else