i have this estranged situation: I have two ASA's 5520 in Active/Standby failover mode. After the software update from 8.2(1) to 8.2(2) one of NAT(PAT) rules in outside interface unexpectedly disappeared from startup configuration/running configuration. The estranged situation is that the only the LAST rule disappeared. I think that this could be a memory allocation bug or something like that.
Do you saw something like that?
Searching for bugs in cisco bug toolkit, i found this one:
|Unexpected ACL recompile failure messages ( CSCtd34212 )|
Due to memory exhaustion issues ACLs were not properly compiled and traffic was failing.
While working on a 5520 in the solution test set up and trying to run a mix of HTTP, SMTP, DNS, SIP traffic it was observed from the Agilent test tool that the SMTP traffic was not passing. Upon further review the following messages were seen on the console:
% Failed to allocate regular expression state table: 520FAIL re_compile, not all rules are compiled
This appears to be a memory exhaustion issue.