[H-GEN] sendmail timeout problem

[Jay]

On Fri, 12 Dec 2003 15:49, Robert Brockway wrote:
> On Fri, 12 Dec 2003 johannes at paradise.net.nz wrote:
> > Running sendmail 8.11.6 essentially works just fine except a couple of
> > domains do consistently time out with the message "Deferred: Connection
> > timed out with smtp.domain, or smtp2.domain"
>
> Try this:
>
> cat /proc/sys/net/ipv4/tcp_ecn
>
> If you get a 1 come back, then set it to be 0:
>
> echo 0 > /proc/sys/net/ipv4/tcp_ecn

Oh boy, you are worth your weight in gold or so. This worked just like a 
charm.

> If you use ecn some remote routers will go gaga on you.  I've seen this
> exhibit as "truly bizarre" mail problems.

> Also, could you have a problem wityh PMTU (path mtu) discovery?  Are you
> using ADSL (which is renouned for PMTU problems).  This will exhibit as
> large mails failing but small mails working.

I actually played with that this morning to no avail.

Cheers

Johannes
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