Cannot access network shares

Suddenly, none of my computers on the domain can access the network shares or shared printers from my SBS 2003 domain controller. The permissions are still good, all services are fine, no errors on server. Even when logged into a workstation as the domain admin, I get "The operation being requested was not performed because the user has not been authenticated" when trying to access the server shares via its UNC path.

Workstations are Win7, up to date. SBS 2003 server is up-to-date.
NRTCFAsked:
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NRTCFConnect With a Mentor Author Commented:
ARrrrrrrghh. Symantec network protection turned on somehow even though I have it disabled. That was it. :)
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g000seCommented:
Hi,

Can you ping the SBS 2003 dc by name from a workstation?  If you cannot, you may need to restart your DNS service.
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NRTCFAuthor Commented:
Oops, forgot to include that. Yes, I can ping both directions, by name or by IP address. I've restarted the workstations already.
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g000seCommented:
The ping has been successful?
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g000seCommented:
Also, did you try restarting your server too?

do you have any other DCs on the network?
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g000seCommented:
Can you access the share by-  \\ip address of server\sharename   ?
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Darius GhassemCommented:
Make sure you are only pointing to the SBS server for DNS in the TCP\IP properties both for the clients and SBS server
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