Hi guys,
we have been using ISA 2006 with Web Publishing Rule to provide access for mobile phone to corporate Exchange via ActiveSync for years. The issue occurred roughly one month ago.
After some period of time (usually it happens once or twice daily) ISA stops to accept connections from the mobile phones. There are no errors on client devices (they don't get new mails). In Sessions tab I see that only SecureNAT sessions from phones remain, but no Web Proxy sessions any more. There are no errors in Event Viewer and I didn't find anything strange in diagnostic logs.
I've created one more Web Publishing Rule with the same Web listener as for ActiveSync rule for OWA. The intersting thing that ISA still allows access to OWA when issue occurs. Looks like the problem with Web Proxy filter.
After OS restart ISA starts working normally.
I have ISA 2006, sp1, version 5.0.5723.514 installed on VMWare VM with Windows 2003 SE sp2.
Do you have any ideas?