Network connectivity between Windows 7 pcs was down, but can connect to the net

Hello,
I have been in this field a long long time and I saw something today that really baffled me. I have a network of 8 pcs. Using one Windows 7 pc as a server. All of a sudden, none of the 8 pcs (all Windows 7, 64 bit Dell XPS') could NOT talk to each other or the server. But, I can remote into one of the 8 pcs and can get on the net. So it was not the cable modem or the hub. I need to verify the pc I logged into had a fixed IP address but no...the server (Windows 7 pc) had a fixed IP address and it was isolated from everything else but still had access to the internet. The AV on all is Norton Internet Security 2013/14. In my past experience, if there is an attack, Symantec's products shutdown the offending IP address...so this is what I am going on. At other places, I have Symatnec Endpoint Protection blocking attacking pcs for 10 minutes. Becuase all of a sudden, everything started working again. The pcs were already updated with Microsoft Updates...strange things happen on every second Tuesday of the month I swear. What do you think? The hubs are all new, switches are new, cable modem is new. Wiring is in perfect shape.
Thanks,
J
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dronethoughtAsked:
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dronethoughtConnect With a Mentor Author Commented:
Did further research. the Function Discovery Resource Publication was not turning on. Even though I set it to Automatic, Now I have it as Automatic (Delayed). Also, need Computer Browser to be on Automatic when using a Windows 7 pc as a file share. I thought it was an update but it was not.

As for the default FW in Windows 7, the built in FW has failed me on an virus that was a fake "Update your Flash Player" executable. The fake .exe file was able to go out and download the virus contents. The built in FW was on. All rules set correctly. The executable could not pass through Symantec's corporate product.
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DMTechGrooupCommented:
I think you issue is the Norton FW.. if you have a good endpoint FW, imo, there isnt much need for a FW other than the default windows FW on the client.

Also it could be a netbios or DNS deal.. did you try contacting the other PC's with the IP addresses?
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Scott ThomsonCommented:
Check when updates on the machines / server are occuring (especially AV)
because i would suggest that this is what may be the case.

Do your server/workstations update automatically..? that sounds like its in tune with MS update releases..
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