Server inaccessible

I am the admin of a small SBS 2003 Standard installation with six
users. All clients are XP SP2.

Friday morning the users reported that the server was inaccessible.
They could not access shares and Outlook could not connect to Exchange.

I immediately logged on to the server remotely and everything looks
fine on the server.

All client PCs can still access the Internet (with the help of the DNS
on the server). OWA still works and email flows in and out.

It takes forever to log on to the workstations.

This is in my experience often a DNS problem. However DNSlint can find
no problems and all the resource records semes to be there. The DNS on
the SBS is the only one used by the clients and the server.

DCDIAG and NETDIAG reports no problems when run on the server.

The server can access shares on the workstations, but not the other way
around.

I have tried a different Ethernet switch, but no change.

The server was running SBS RTM with EXCHSP1. I have now installed 2003
SP1, EXCHSP2 and SBS SP1 etc, but no change.

According to the workstations the server does not exist. I can control
the server with RDC from the workstation, but when I install the
Adminpak.msi and try to use Terminal Server Admin from a client PC, no
access. Ping works, telnet to all the different ports work. I can
access LDAP. All Active Directory tools work on the server. Printer
sharing does not work, but I can print from the server.

The client PCs still have access to their local files since they are
replicated locally.

The eventlog on the client PCs are saying: Event ID: 1053 Windows can't
determine the user or computer name (RPC server is not available).
Group policy processing is aborted (translated from the Norwegian text
in the eventlog and might not be identical to the english text).

There ar no trace of the logon atempt in the eventlog on the server.

Why did all the clients lose contact at the same time? The problem must
be on the server.

I really hope I don't have to spend the weekend reinstalling. Please
help.

Erik

.

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