In newSession (readconnroute.c) connect_dcb will create backend connection via backend_dcb->func.connect()

session_alloc will not start a newSession for the LISTENING socket

In dcb.h void *data was added to keep protocol session data if the session is not started in accept(9 but later.

modules/routing/readconnroute.c

@@ -209,7 +209,8 @@ int		i;
 	 * Open a backend connection, putting the DCB for this
 	 * connection in the client->dcb
 	 */
-	//client->dcb = backend_connect(session);
+
+	client->dcb = connect_dcb(candidate->server, session, candidate->server->protocol);
 
 	/* Add this session to the list of active sessions */
 	spinlock_acquire(&inst->lock);