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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