There was a problem with TMG SP1 that would cause that behavior. What update level do you have installed? If you're not sure, use http://blogs.technet.com/b/isablog/archive/2009/02/25/isa-server-build-numbers.aspx to sort it out. Jim Harrison E: jim@xxxxxxxxxxxx<mailto:jim@xxxxxxxxxxxx> C: 425-591-6122 Astrophysicists assure us that the universe has no center; therefore, you cannot be it. David McCullough Jr. From: isapros-bounce@xxxxxxxxxxxxx [mailto:isapros-bounce@xxxxxxxxxxxxx] On Behalf Of Ball, Dan Sent: Friday, July 27, 2012 12:27 To: 'isapros@xxxxxxxxxxxxx' Subject: [isapros] Strange errors I'm having TONS of errors in the TMG log, clients are working fine one minute, and a minute later they cannot browse the Internet. This is intermittent. Sometimes they can wait and it will clear, other times I reboot the TMG server and it clears up. Looking at the logs, they are hitting the default rule with a 0x800733f5 WSA_RWS_ERROR_ACCESS_DENIED error. Before I had suspected the Websense filter plug-in as the culprit, but they are still getting that error when that plug-in is disabled. Anyone got a good starting place to troubleshoot this issue?