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451 4.7.0 Timeout waiting for client input

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451 4.7.0 Timeout waiting for client input - 12.Feb.2010 4:48:05 AM   
vlc

 

Posts: 5
Joined: 19.Jan.2010
Status: offline
Hi!

A customer of ours has some weird smtp logs. I did some tests with 30 times the same mail, same attachment(1MB).

Sometimes it gets trough, sometimes it gets trough but attachment is corrupted and sometimes it doesnt even get trough at all.

Something i see in the logs is: "451 4.7.0 Timeout waiting for client input". Exactly after 1 minute! Sometimes at a later point it works but there is a huge delay on the mail.

IPS is disabled atm on our Sonicwall.

These are the settings on the receive connector:
ConnectionTimeout: 00:10:00
ConnectionInactivityTimeout: 00:01:00

The internet line of the company isnt really fast, they have 1Mbs Down/140kbps Up.

If someone has any similar experience please help me :)
Post #: 1
RE: 451 4.7.0 Timeout waiting for client input - 24.Feb.2010 2:56:36 PM   
uemurad

 

Posts: 8232
Joined: 7.Jan.2004
From: California, USA
Status: offline
How far into the SMTP sequence does the communication get before that timeout message happens?  HELO-->MAIL from-->RCPT to-->DATA-->QUIT

HELO may be replaced with EHLO, and DATA may be replaced by BDAT.

The key is to figure out what what your server wants from the sender, and from there you may be able to realize why the sending system isn't proceeding.

_____________________________

Regards,

Dean T. Uemura
Microsoft MVP - Exchange (2007-2011)
exchangeguy.blogspot.com
uemurad@yahoo.com

(in reply to vlc)
Post #: 2

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