I used Cisco's SDM to configure the stateful firewall component on a Cisco 877 but I let it add all the automatic Instant Messenger rules.

That's when things started going wrong. The Cisco crashed and reloaded... probably 10 times a day.

Deleting the IM stateful inspection rules fixed the continual reload problem.

The crashinfo file on the router contained these tell tale entries...

-Traceback= 0x81E985EC 0x80C43388 0x808676A0 0x80C45D1C 0x81A29B74 0x81A2A248 0x8036A34C 0x8036D490 
000190: *Jul 22 21:29:37.639 PCTime: %SYS-3-CPUHOG: Task is running for (120000)msecs, more than (5000)msecs (246/2),process = Appfw IM DNS Resolver.
-Traceback= 0x81E985EC 0x80C43388 0x808676A0 0x80C45D1C 0x81A29B74 0x81A2A248 0x8036A34C 0x8036D490 
000191: *Jul 22 21:29:42.699 PCTime: %SYS-3-CPUHOG: Task is running for (125000)msecs, more than (5000)msecs (261/2),process = Appfw IM DNS Resolver.