--- a/plugins/mod_s2s/mod_s2s.lua	Sat Aug 23 09:22:05 2014 +0100
+++ b/plugins/mod_s2s/mod_s2s.lua	Sat Aug 23 09:29:17 2014 +0100
@@ -407,6 +407,7 @@
 
 function stream_callbacks.error(session, error, data)
 	if error == "no-stream" then
+		session.log("debug", "Invalid opening stream header (%s)", (data:gsub("^([^\1]+)\1", "{%1}")));
 		session:close("invalid-namespace");
 	elseif error == "parse-error" then
 		session.log("debug", "Server-to-server XML parse error: %s", tostring(error));