Sean Durkin:
> Hi Wietse,
>
> Am 11.09.2014 um 13:49 schrieb Wietse Venema:
> > What is the distribution of DATA sizes before failure? In your
> > example I see numbers around 3kB, 9kB, 12kB.
>
> At the moment, I see these sizes:
>
> - always exactly 17511 bytes from smtp-out-127-*.amazon.com (today, seems to
> be only 3 different hosts trying)
> - always exactly 49116 bytes from *.psi.cust-cluster.com (I've seen about 60
> different hosts from there today)
> - always exactly 33290 bytes from mail18-*.srv2.de (about a dozen different
> hosts)
>
> It seems those are always the same 3 messages being re-tried
> constantly (when I look at them in the incoming queue folder, it's
> the same recipient and sender and the same message-ID, as far as
> I can tell). I have problems only with messages from these clusters,
> everything else seems unaffected (at least I haven't seen any "lost
> connection" messages from any other hosts as far as my logfiles
> go back).
>
> Yesterday I had an additional message with exactly 17441 bytes on
> every try before failure from the Amazon-cluster. That one was
> finally delivered completely early this morning, and has since
> disappeared from the cycle.
That increases my suspicion of a data-dependent error - some marginal
cable/switch/router, perhaps some middle box with a memory bit error
that requires a power cycle to clear the problem. If the problem is
caused by crosstalk defect, then only physical replacement will
solve it.
> Problem is that this box is a rented root server in a data center
> somwhere, so I don't have access to the hardware to try any of
> that. I can contact support, but they of course charge you for
> everything they do, and as long as I haven't ruled out that the
> reason is just some stupid configuration mistake on my part (or a
> routing/filtering issue at my hosting provider, or Amazon, or...),
> I don't want to start replacing hardware, obviously...
Try power cycling.
Wietse
