--- a/core/s2smanager.lua	Sun Feb 12 17:55:22 2012 +0000
+++ b/core/s2smanager.lua	Sat Feb 25 02:03:26 2012 +0000
@@ -432,7 +432,7 @@
 	local conn, handler;
 	if connect_host.proto == "IPv4" then
 		conn, handler = socket.tcp();
-	else
+	elseif socket.tcp6 then
 		conn, handler = socket.tcp6();
 	end