Workstation is disconnected from the network every day at 4:30 PM

I administer a network with 12 XP clients and a Windows Small Business Server (2003).  There are 2 workstations that are disconnected from the network everyday at 4:30 PM sharp.  All network drives are disconnected.  If you restart them, the problem goes away until the next day at the same exact time.  It is only happening to these 2 computers.  Has anyone experienced this issue before?
webaddoAsked:
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DrDave242Commented:
Are those two workstations using the SBS server as their only DNS server?  They should be.
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webaddoAuthor Commented:
No they are not.  I'll make the change now.  Any other suggestions?
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webaddoAuthor Commented:
However, all the workstations are stup the exact same way, yet only those 2 have the issue.
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dekkarCommented:
How did you deploy these machines in the first place?

Did you use ghost? I had a client who ghosted all of their machines, but didnt ghostwalker a few of thier machines, everything was fine until they upgraded their network to 2003, and the server took notice of the SID...

It would continually boot those machines off the network for having the same SID....

I dont know if it applies, it just came to mind.....

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dekkarCommented:
also when you said booted off the network, can they ping? or get out to the internet? or access other resources on the network??

can they still see eachother??

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webaddoAuthor Commented:
They can access anything except the server.   Accessing Internet and other workstations are fine.
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DrDave242Commented:
I'm actually surprised that those other machines aren't having the same problem.  As a rule, domain members (and I'm assuming you've joined them to the SBS domain using the "ConnectComputer" wizard) should only use internal DNS servers for accurate and consistent name resolution.  In this case, that would of course be your SBS server.  The only place you should see external DNS servers are in the DNS forwarder list of your SBS server.
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bigcurefanCommented:
Are there any log entries in the control panel/administrative tools/event viewer around 4:30 on the workstations or server?
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webaddoAuthor Commented:
I checked the error logs and it pointed to DNS issues.  I found the DNS settings on the workstations were incorrect.  After the changing the settings the problem went away.  Thanks!
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