Companyweb/Internal LAN Lock out

I am running Server 2003 Small Business Edition SP1 with Sharepoint SP2 on a
domain.
Every couple of hours a terminal will get locked out of the internal LAN and
be denied access to companyweb, we are still able to ping the main server and
access the internet though. Error messages we've received are:

"\\Companyweb\folder is not accessible. You might not have permission to use
this network resource. Contact the administrator of this service to find out
if you have access permissions. The network path was not found."

"The folder http://companyweb/folder/ is no longer available. The web server
is busy. Please try again later."

The problem is solved by repairing the network connection, but soon returns
later on in the day.

Thanks,
Dean

In news:EC6F0246-2D83-47AD-8B0C-(E-Mail Removed),
Dean <(E-Mail Removed)> typed:
> I am running Server 2003 Small Business Edition SP1 with Sharepoint
> SP2 on a domain.
> Every couple of hours a terminal will get locked out of the internal
> LAN and be denied access to companyweb, we are still able to ping the
> main server and access the internet though. Error messages we've
> received are:
>
> "\\Companyweb\folder is not accessible. You might not have permission
> to use this network resource. Contact the administrator of this
> service to find out if you have access permissions. The network path
> was not found."
>
> "The folder http://companyweb/folder/ is no longer available. The web
> server is busy. Please try again later."
>
> The problem is solved by repairing the network connection, but soon
> returns later on in the day.
>
> Thanks,
> Dean

Hi - I suggest you post in microsoft.public.windows.server.sbs to see if any
of the SBS gurus have suggestions. Include any event log messages you get.
Also make sure your internal workstations are pointing *only* at the
internal DNS server IP for DNS.