lost connection with [mailserver] while sending message body

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cyberwired
Posts: 33
Joined: 03 Jan 2014 21:57

lost connection with [mailserver] while sending message body

Post 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?
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shawniverson
Posts: 3644
Joined: 13 Jan 2014 23:30
Location: Indianapolis, Indiana USA
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Re: lost connection with [mailserver] while sending message

Post by shawniverson »

What is the source of your fix? Are you using vmware or hyperv?
cyberwired
Posts: 33
Joined: 03 Jan 2014 21:57

Re: lost connection with [mailserver] while sending message

Post 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
menny
Posts: 16
Joined: 30 Mar 2014 15:32

Re: lost connection with [mailserver] while sending message

Post by menny »

hi there.
did you find a solution to your issue?
I think i"m having the same problem with my EFA.
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