diff -Burb qsrc-pq350/net_dgrm.c qsrc-pq350-ssp/net_dgrm.c
--- qsrc-pq350/net_dgrm.c	2002-09-18 10:04:46.000000000 -0700
+++ qsrc-pq350-ssp/net_dgrm.c	2003-10-20 12:22:54.000000000 -0700
@@ -1,3 +1,8 @@
+/* *** EXPERIMENTAL *** */
+#define SINGLE_SERVER_PORT
+/* *** EXPERIMENTAL *** */
+
+
 /*
 Copyright (C) 1996-1997 Id Software, Inc.
 
@@ -1083,7 +1088,30 @@
 	if (control == -1)
 		return NULL;
 	if ((control & (~NETFLAG_LENGTH_MASK)) !=  NETFLAG_CTL)
+	{
+#ifdef SINGLE_SERVER_PORT
+		/* ProQuake 3.4 (and up) clients close their request socket
+		** and make a new socket for the session.  This means we
+		** connected back to the wrong socket when accepting the
+		** connection.  So we look for a "bogus" request packet 
+		** from that client on a different port, and re-connect 
+		** back to that port instead.
+		*/
+		for (s = net_activeSockets; s; s = s->next)
+		{
+			if (s->driver != net_driverlevel || !s->net_wait)
+				continue;
+			ret = dfunc.AddrCompare(&clientaddr, &s->addr);
+			if (ret == 1)
+			{	//same client, different port: reconnect back
+				dfunc.Connect (s->socket, &clientaddr);
+				/* TODO: check for failure, report error, etc */
 		return NULL;
+			}
+		}
+#endif //SINGLE_SERVER_PORT
+		return NULL;
+	}
 	if ((control & NETFLAG_LENGTH_MASK) != len)
 		return NULL;
 
@@ -1309,7 +1337,15 @@
 		return Datagram_Reject("Server is full.\n", acceptsock, &clientaddr);
 
 	// allocate a network socket
+#ifdef SINGLE_SERVER_PORT
+	{
+		struct qsockaddr oldaddr;
+		dfunc.GetSocketAddr(acceptsock, &oldaddr);
+		newsock = dfunc.OpenSocket(dfunc.GetSocketPort(&oldaddr));
+	}
+#else //SINGLE_SERVER_PORT
 	newsock = dfunc.OpenSocket(0);
+#endif //SINGLE_SERVER_PORT
 	if (newsock == -1)
 	{
 		NET_FreeQSocket(sock);
diff -Burb qsrc-pq350/net_udp.c qsrc-pq350-ssp/net_udp.c
--- qsrc-pq350/net_udp.c	2002-05-27 11:27:18.000000000 -0700
+++ qsrc-pq350-ssp/net_udp.c	2003-10-16 13:11:13.000000000 -0700
@@ -1,3 +1,8 @@
+/* *** EXPERIMENTAL *** */
+#define SINGLE_SERVER_PORT
+/* *** EXPERIMENTAL *** */
+
+
 /*
 Copyright (C) 1996-1997 Id Software, Inc.
 
@@ -175,6 +180,14 @@
 	if (ioctl (newsocket, FIONBIO, (char *)&_true) == -1)
 		goto ErrorReturn;
 
+#ifdef SINGLE_SERVER_PORT
+	if (port)
+	{
+		int fReuse = 1;
+		setsockopt(newsocket, SOL_SOCKET, SO_REUSEADDR, &fReuse, sizeof(fReuse));
+	}
+#endif //SINGLE_SERVER_PORT
+
 	memset(&address, 0, sizeof(struct sockaddr_in)); // JPG 1.05 - fix by JDC
 	address.sin_family = AF_INET;
 	address.sin_addr.s_addr = myAddr; // JPG - changed INADDR_ANY to myAddr
@@ -260,7 +273,11 @@
 
 int UDP_Connect (int socket, struct qsockaddr *addr)
 {
+#ifdef SINGLE_SERVER_PORT
+	return connect(socket, (struct sockaddr *)addr, sizeof(*addr));
+#else //SINGLE_SERVER_PORT
 	return 0;
+#endif //SINGLE_SERVER_PORT
 }
 
 //=============================================================================