I also set tcp_windowsize = 65535 but this had no effect on the ability to
send the emails.
Rob A wrote
> Wietse,
>
> Thanks for your response.
>
> I can consistently send a 1 MB attachment to a recipient with no issues,
> but consistently get "421 4.4.2 service time
my postfix server:
*# cat /proc/sys/net/ipv4/tcp_window_scaling
0*
And tcpdump indicates no scaling is used as well:
*[Window size scaling factor: -2 (no window scaling used)]*
Is there something else I should be looking at to resolve the issue?
- Rob A
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What sort of network stats would be useful to diagnose the problem? Below is
the output of netstat -s
It looks like data is being transmitted fine up until the point that the
remote server sends a [TCP Window Update] (see packet 1750 below). At that
point my postfix server doesn't respond and th
We are having issues sending emails with attachments over ~2 MB to some
recipients. In the situations were we have an error, the remote server
responds with "421 4.4.2 service timed out. (in reply to end of DATA
command)".
We are not having these issues with all recipients, but there are many
r
