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SBS not connecting to internet

I have a SBS 2003; suddenly today the internet stop working for the worksations and the SBS server itself. I troubleshooted the networking part and the network seems fine (I connected a laptop outside the domain directly to router and I get internet access, also I connected same laptop to the same port of the server and several workstations and the laptop connects with no problem). I cannot ping outside the network, nslookup doesnt find anything. We do not have proxy settings. Since no workstation can connect to the internet I assume that it is a SBS error. I do not know what else to do
Please help, its very urgent.
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Olaf De Ceuster
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thank you; the isp just forgot to let us know that their dns table changed.

guess, what? the internet is working only on the sbs but not in the workstations. what should i do?
At workstation command prompt: type ipconfig /flushdns.
Or just restart the workstations.
The DNS on the workstations should point at your server IP.
This does probably mean your workstations were not connected with the connectcomputer wizard.
Here is how:
To rerun the connectcomputer follow these steps:

1.  Log with local admin account.
Backup your profiles first!
2.  Join a Workgroup (Unjoin from Domain)
3.  Delete or rename the following directory C:\Program Files\Microsoft Windows Small Business Server\Clients if it exists (Thanks Jeff)
4.  Delete this Registry Key:  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\smallbusinessserver (Thanks Jeff)
5.  In network settings TCP/IP: Obtain IP automatically, obtain DNS Automatically + File and Print Sharing enabled
6.  Reboot

On server Management Console:
1.  Remove the client computer
2.  Create a NEW UnIQUE computer Account in the server Management Console.

On workstation:
In browser while logged on as local admin: type: http://<your server name>/connectcomputer. Say yes to Active X and join using the newly created Computer account.
The workstation will restart twice.
Hope that helps,