After you apply Microsoft Internet Security and Acceleration (ISA) Server 2006 Service Pack 1 (SP1), the Firewall service (Wspsrv.exe) may crash intermittently.
Additionally, the following events are logged in the Application log:This problem occurs when the caching functionality is enabled and when there are content type-based rules.
Additionally, the following events are logged in the Application log:This problem occurs when the caching functionality is enabled and when there are content type-based rules.