This just popped up today - not sure if they are related, but I'm guessing it is. This morning I was logged in remotely to a clients server running updates, etc. and noticed that the antivirus program update was unable to connect to the update servers. Then I figured out that I could not open any web sites using IE or Firefox. Logged into a different server at that same office and got the same result. I can ping google.com and get replies. I'm able to login remotely using 2 different remote control methods, but there is no internet.
Then I just got a call from another client who was trying to install a program on their network and the server wanted to reboot. The program was a bundled software called Mionet that came with a new Western Digital external hard drive. After rebooting, the server cannot access the Web, though it is online, and the workstations cannot contact the domain to login, though they also appear online. Is there some new virus or Windows update gone bad that I've not heard of yet?
They have different ISPs so I was able to rule out problems with their ISP's DNS servers.
Nothing weird in the event logs - no services failing to start.