diff -r 7311dc843718 -r 8613086779fa plugins/mod_s2s/mod_s2s.lua
--- a/plugins/mod_s2s/mod_s2s.lua	Tue Sep 27 22:01:13 2016 +0100
+++ b/plugins/mod_s2s/mod_s2s.lua	Tue Sep 27 22:01:46 2016 +0100
@@ -365,7 +365,7 @@
 	elseif session.direction == "outgoing" then
 		session.notopen = nil;
 		if not attr.id then
-			log("error", "Stream response did not give us a stream id!");
+			log("warn", "Stream response did not give us a stream id!");
 			session:close({ condition = "undefined-condition", text = "Missing stream ID" });
 			return;
 		end