On Sat, Oct 11, 2008 at 11:03:37AM -0400, Sahil Tandon wrote:
> Thank you and Viktor for your response. The sending MTA continues to
> retry on an hourly basis. I ran tcpdump as per the DEBUG_README and
> pasted one session capture (the output of tshark -n -r tcpdump_file) at
> the URL below. Prior to tshark, I tried viewing the tcpdump file with
> the following: tcpdump -nA -r tcpdump_file. However, the output of
> that commmand reveals the email as it was written, headers, etc. I wasn't
> sure that was necessary to debug the issue. But if it is, I'm happy
> to post that as well.
>
> I understand it is generally better to paste relevant excerpts in the
> body, but this particular capture is quite large!
>
> [TCP Previous segment lost] is followed by several duplicate ACKs, and
> eventually a 421 timeout error.
>
> http://pastebin.com/m7fb47518
Your server offers Window scaling (WS=3). Either the client's firewall or
yours is confused by window scaling. You may need to turn window scaling
off (it is a pity that many "new" TCP features are unusable in practice
due to firewall breakage).
--
Viktor.
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