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?