Index: uspace/srv/net/tcp/ucall.c
===================================================================
--- uspace/srv/net/tcp/ucall.c	(revision a2e3ee6092cd450ed63e80fa45ddb46a740aa02c)
+++ uspace/srv/net/tcp/ucall.c	(revision 205261f43889bacefc7f9533f7d8562779a303fb)
@@ -298,4 +298,8 @@
 	tcp_conn_t *conn;
 
+	log_msg(LOG_DEFAULT, LVL_DEBUG,
+	    "tcp_as_segment_arrived(f:(%u), l:(%u))",
+	    sp->foreign.port, sp->local.port);
+
 	conn = tcp_conn_find_ref(sp);
 	if (conn == NULL) {