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SMTPSVC Event ID 402 Error

Posted on 2008-10-28
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Last Modified: 2013-02-02
I have a client running Exchange 2003 SP2 on a Windows 2003 server.  Everything had been working fine for the last few years, but over the last couple of months the server stops processing incoming email, the maximum number of connections in Exchange is reached and it starts logging the SMTPSVC 402 errors.  No email is delivered until the server is restarted.  The users can still send outgoing email, but not receive incoming.  I need help figuring out what may be causing the Exchange server to stop processing the email, thus leading to the connections filling up and creating the SMTPSVC 402 error.  I have checked on mxtoolbox.com and the server is not a relay.
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Question by:perk83
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by:florin_s
ID: 22822240
Hi,

Try this:

If SMTP is installed as part of MS Exchange then open System Manager, navigate to Servers -> <Server name> -> Protocols -> SMTP -> Virtual Server 1 properties -> General tab, and increase the value for "Limit number of connections to".
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by:perk83
ID: 22822292
What should be a good number of connections?  It is currently set at 500 and this is an office with only about 35 people.
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by:florin_s
ID: 22822394
Try to uncheck the "Limit number of connections to", at our company we do not have this and works fine
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perk83 earned 0 total points
ID: 22840975
I actually found some more information on this issue.  Here are a few links that will hopefully help people in the future.  It appears to be a problem with the Sender filtering feature in Exchange 2003 SP2.

http://www.eggheadcafe.com/software/aspnet/32610917/exchange-2003-smtp-sessio.aspx

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_23435745.html

http://support.microsoft.com/kb/927478

I also don't think it is a good idea to unrestrict the number of connections on the SMTP virtual server, therefore I am going to close this question as answered by myself.  I do greatly appreciate your assistance though.
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