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lost connection while sending end of data -- message may be sent more than once

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Stanisław Findeisen

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Feb 24, 2011, 4:29:50 AM2/24/11
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Hi

I am getting such errors in the log:

Feb 24 10:03:21 * postfix/smtp[9203]: C2EFF1823C1: lost connection with
ASPMX.L.GOOGLE.COM[74.125.43.27] while sending end of data -- message
may be sent more than once

This happens many times a day with various servers --- not just
google.com. Otherwise everything works fine.

What do you think the problem is?

The puzzling thing is also this one:

$ host 74.125.43.27
27.43.125.74.in-addr.arpa domain name pointer bw-in-f27.1e100.net.

??

--
Eisenbits - proven software solutions: http://www.eisenbits.com/
OpenPGP: DFD9 0146 3794 9CF6 17EA D63F DBF5 8AA8 3B31 FE8A

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Wietse Venema

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Feb 24, 2011, 7:09:50 AM2/24/11
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Stanisław Findeisen:

> Hi
>
> I am getting such errors in the log:
>
> Feb 24 10:03:21 * postfix/smtp[9203]: C2EFF1823C1: lost connection with
> ASPMX.L.GOOGLE.COM[74.125.43.27] while sending end of data -- message
> may be sent more than once
>
> This happens many times a day with various servers --- not just
> google.com. Otherwise everything works fine.
>
> What do you think the problem is?

Don't speculate, measure. Look at packet traces with tcpdump,
and see at what point the connection breaks.

- Does the problem only happen with connections that use TCP window
scaling? If so, you have a borked firewall that mis-implements TCP.

- Does the problem go away with small messages? If so, you have a
broken IP path MTU problem.

And so on, there are many reasons why TCP can break.

Wietse

> The puzzling thing is also this one:
>
> $ host 74.125.43.27
> 27.43.125.74.in-addr.arpa domain name pointer bw-in-f27.1e100.net.
>
> ??
>
> --
> Eisenbits - proven software solutions: http://www.eisenbits.com/
> OpenPGP: DFD9 0146 3794 9CF6 17EA D63F DBF5 8AA8 3B31 FE8A
>

-- End of PGP section, PGP failed!

Victor Duchovni

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Feb 24, 2011, 10:16:48 AM2/24/11
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On Thu, Feb 24, 2011 at 10:29:50AM +0100, Stanis??aw Findeisen wrote:

> The puzzling thing is also this one:
>
> $ host 74.125.43.27
> 27.43.125.74.in-addr.arpa domain name pointer bw-in-f27.1e100.net.

Lets guess what "1e100.net" is: looks like "scientific notation" for 1
times 10 to the 100th power, which is sometimes called a "googol"...

--
Viktor.

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