diff -r c5c6da8e42db -r 2a424950463d server/repository.py
--- a/server/repository.py	Wed Apr 24 15:33:49 2013 +0200
+++ b/server/repository.py	Wed Apr 24 15:37:43 2013 +0200
@@ -985,7 +985,7 @@
         self.debug('cleaning session unused since %s',
                    strftime('%T', localtime(mintime)))
         nbclosed = 0
-        for session in self._sessions.itervalues():
+        for session in self._sessions.values():
             if session.timestamp < mintime:
                 self.close(session.id)
                 nbclosed += 1