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lost connection with [mailserver] while sending message body
Posted: 08 Apr 2014 00:13
by cyberwired
We've had a number of issues with larger emails (up to 12mb, some 5, some 10) not flowing through to the mail servers.
I've just done the following:
Code: Select all
[root@efa ~]# echo 0 > /proc/sys/net/ipv4/tcp_window_scaling
[root@efa ~]# /etc/init.d/postfix restart
Which has appeared to fix the problem.
Not fully sure the repercussions of this or why I'm having to do it though?
Re: lost connection with [mailserver] while sending message
Posted: 08 Apr 2014 23:37
by shawniverson
What is the source of your fix? Are you using vmware or hyperv?
Re: lost connection with [mailserver] while sending message
Posted: 08 Apr 2014 23:44
by cyberwired
Using vmware
Still having issues with my second EFA server.
I'm kinda stumped, it seems to have issues to some mail servers and not to others (all Exchange 2010 behind same firewall gear)
Not doing Cisco SMTP inspect
MTU have tried putting it down, tried even lowering to 900
Doing port sniff on mail server, EFA seems to start sending the email fine. The attachment sending process goes as 2 or 3 packets from EFA, 2 ACK from mail server, back and forth.
Then EFA just stops sending packets and the mail server sends 6 ACK packets but gets no response, then times out.
Tried using TCPDUMP but with how much it processes its hard to narrow down as to if EFA is getting the ACK from mail server
Re: lost connection with [mailserver] while sending message
Posted: 27 Apr 2014 18:21
by menny
hi there.
did you find a solution to your issue?
I think i"m having the same problem with my EFA.