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Monday, April 27, 2009

Exchange SMTP Internet Connector frequently down

You have Exchange 2003 Front-End server configure to route emails to third party appliance smart host. One day the Exchange Internet connector frequently converted to down state causing mail queue when sending to external address. No issue when the connector is configures to use DNS instead of smart host to dispatch email. You have check for possible Antivirus or SMTP Protocol issue using Winroute and Regtrace but everything looks ok.
On the Netmon trace result, you can see that Exchange didn’t receive ACK for certain packet from the smart host and it terminates the connection after some times.

Make sure that the network speed and duplex setting at the smart host is the same with the connection setting at core switch. Running manual setup might be required to eliminate the issue.

1 comment:

Alex said...

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