Welcome to Matts Admin tips. This blog is full of little fixes, tutorials and work-arounds to those anoying problems that a Systems Administrator might face. If you find something that you have found useful please leave me a comment - I appreciate knowing that I've helped! Also, feel free to leave a comment if my tips or ideas don't work in your environment... I monitor them closely and would be happy to help! Matt

Exchange 2007 500 Firewall Error

Posted December 31st, 2008 by Matt Shadbolt

If your having intermittent DSN errors returning to your users with the message “mail.someremoteserver.com #500 Firewall Error##” I’ve found the the error is actually due to your local Cisco router/firewall. It seems that some Cisco routers and IOS versions that use the ip inspect command on the outgoing interface have problems with the newer Exchange [...]

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