On Apr 18, 2008, at 1:01 PM, Charles Marcus wrote: > On 4/18/2008, Jonathan Dill ([EMAIL PROTECTED]) wrote: >> If you are using a separate e-mail relay, could also be firewall >> issue, > > Is there by any chance a CISCO router in the mix anywhere?
Yes exactly, I have seen the same type of thing with SonicWALL as well--the firewall sends back an RST to kill the connection, and the server thinks that the other end dropped the connection and you get "Connection unexpectedly closed". If you have IPS and "deep packet inspection" there are even more reasons the firewall could decide to kill the connection, even if the allow / accept rules all look correct, hopefully there is some sign in the firewall logs if that is the case. Even if there is not a firewall or router and something completely different is going on, you can learn a lot by picking apart a packet trace off the server or especially the firewall, the "follow tcp stream" option in wireshark or ethereal is priceless, then you can follow the conversation. Even if everything is happening in loopback (as it should be if it is all supposed to be contained on one server) you can still sniff on the loopback connection. Or you may discover that some of the traffic is getting sent out on the wire that is supposed to stay on the same box e.g. if DNS or /etc/hosts is not up to date. Jonathan ------------------------------------------------------ Mailman-Users mailing list Mailman-Users@python.org http://mail.python.org/mailman/listinfo/mailman-users Mailman FAQ: http://www.python.org/cgi-bin/faqw-mm.py Searchable Archives: http://www.mail-archive.com/mailman-users%40python.org/ Unsubscribe: http://mail.python.org/mailman/options/mailman-users/archive%40jab.org Security Policy: http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq01.027.htp