diff -r 6a4070e2849d -r 499db4fd03f8 server/session.py
--- a/server/session.py	Wed Jun 26 14:35:55 2013 +0200
+++ b/server/session.py	Wed Jun 26 14:26:06 2013 +0200
@@ -431,11 +431,16 @@
 
     is_request = False
 
-    def __init__(self, session, cnxid, session_handled=False):
+    def __init__(self, session, cnxid=None, session_handled=False):
         # using super(Connection, self) confuse some test hack
         RequestSessionBase.__init__(self, session.vreg)
+        # only the session provide explicite
+        if cnxid is not None:
+            assert session_handled # only session profive explicite cnxid
         #: connection unique id
         self._open = None
+        if cnxid is None:
+            cnxid = '%s-%s' % (session.id, uuid4().hex)
         self.connectionid = cnxid
         #: self._session_handled
         #: are the life cycle of this Connection automatically controlled by the