I seem to be getting errors 4005 and 4015 evry other day on my 2003 DC. When this happens all interent is blocked for domains on the controller. I know we still have internet for several reasons, our VOIP system is on a completely different server system but uses the same T1 as well as the router will ping outside websites.
Another weird thing about this is the network will allow some outgoing traffic. I have some scripts that run every 5 minutes to test that my offsite websites are up and running, I get the text message every time while trying to figure out what is up.
The internet is up and running right now but will go down if I cant figure out the cause.
(The DC is a spare Dell I had with a 1 gig proc and 256 memory, running Server 2003 and all updates are current)