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Gary, You found a potential explanation & solution yourself, and we have discussed it further, I am putting it on the record here for everyone else's benefit. First, as discussed, it seems that flushdns did nothing useful, it was the reboots that did all the work. I conclude this because I got exactly the same flushdns advice from ATS the first time I had this problem on my own Vista workstation on campus, but when the problem cropped up again several times later, I skipped the flushdns, did a reboot, and everything worked. Next, you discovered that when this problem occurred, the system would show two default gateways, one being the correct one but the other being 0.0.0.0. After some searching, you learned that this could be caused by Apple's Bonjour service, which frequently gets installed with Apple or Adobe software; it particular, it may get installed with iTunes, QuickTime, and Apple's CD and DVD sharing software. So the solution may be to remove Bonjour. This will have the side effect of disabling access to shared music libraries and iPhone/iPod Remote, but our users can probably do without that functionality. Unfortunatley, Bonjour will probably get installed again with every update to the associated software. -- dkm At 8/30/2011 03:22 PM Tuesday, you wrote: >Ok, I've got one machine over here that every couple of months seems >to get stuck where it seems to be able to talk to at least most >things on campus, but won't connect to anything off campus. In the >past, ATS has had me try doing "ipconfig /flushdns" and then >restarting the computer, and that's cleared things up. However, >this time it doesn't seem to be fixing the problem. > >So, anyone have any thoughts? First, any ideas how to fix this, and >second, any idea why this one particular machine keeps getting into >this state? I have to admit that at the moment I'm kinda stumped. > >Thanks, >Gary