Cisco 2821 IOS Firewall and PAT issues

Unanswered Question
Apr 21st, 2008
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I'm having two odd problems with a 2821 that is used as a firewall. I'll describe one of them.

Every few days, I can not access a server on the internet at port 1055. Running a 'clear ip nat trans *' does not fix the issue. Strangely enough, after reloading the 2821, access from the internal network to the internet server at port 1055 works again.

Additionally, while the problem is occurring, any other port that is listening on the internet server is accessible, just not 1055. A reload fixes the issue.

Also, sh ip nat trans only has about 1000 lines when the problem is occurring.

Any ideas what a permanent solution might be?

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rkalia1 Tue, 04/22/2008 - 04:47
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Check if you have setup low embryonic or max-connections on your access-lists somewhere.


bbrendon Tue, 04/22/2008 - 08:18
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neither of those exist in the router config

smohanasundaram Fri, 05/02/2008 - 21:43
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which IOS you are using.update latest IOS first.its resolves some errors.


S.Mohana sundaram

bbrendon Tue, 06/24/2008 - 15:10
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Upgrading didn't help. The problem magically went away. I'm still not sure what changed. I narrowed it down to a handful of lines in the Cisco config, though none of them should have helped the issue from what I could tell.


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