--- a/server/pool.py	Wed Jan 22 15:35:13 2014 +0100
+++ b/server/pool.py	Thu Jun 27 09:18:39 2013 +0200
@@ -77,7 +77,7 @@
 
     def cnxset_freed(self):
         """connections set is being freed from a session"""
-        self._source.cnxset_freed(self.cnx)
+        pass # do nothing by default
 
     def reconnect(self):
         """reopen a connection for this source or all sources if none specified