Thank you Wen Jian. I don't possess the environment anymore. :-( So I'll try to follow your advice whenever it is reproducible. Posting this message here trying to collect more ideas, in case it happens again. -- Qiu Yu On Wed, Dec 19, 2012 at 8:41 PM, Jian Wen <wenjian at canonical.com> wrote: > , the TCP connection is -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20121219/a8dc2305/attachment.html>