Win2003 Server: Server not reachable + Browser service erros



I manage a simple network with two Win2003 Std and about ~15 clients with
WinXP Pro/Home.

The main problem is that, often the Server1 isn't reachable from any client
of the network, and it's a problem becasue on that server is installed IIS
wich is used by users to work with internet explorer.

After 60-90 seconds the Server1 will be reachable again.

I had watch the event viewer and I found the Server1 have some of this errors:

Event Type: Warning
Event Source: BROWSER
Event Category: None
Event ID: 8021
Date: 26/02/2008
Time: 9.52.40
User: N/A
Computer: SERVER1
Description:
The browser service was unable to retrieve a list of servers from the
browser master \\SERVER2 on the network
\Device\NetBT_Tcpip_{376B7B78-2B53-450A-80DE-D92E61C1F68D}.

Browser master: \\SERVER2
Network: \Device\NetBT_Tcpip_{376B7B78-2B53-450A-80DE-D92E61C1F68D}

This event may be caused by a temporary loss of network connectivity. If
this message appears again, verify that the server is still connected to the
network. The return code is in the Data text box.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 35 00 00 00 5...





Event Type: Error
Event Source: BROWSER
Event Category: None
Event ID: 8032
Date: 26/02/2008
Time: 9.54.33
User: N/A
Computer: SERVER1
Description:
The browser service has failed to retrieve the backup list too many times on
transport \Device\NetBT_Tcpip_{376B7B78-2B53-450A-80DE-D92E61C1F68D}. The
backup browser is stopping.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 35 00 00 00 5...

I had stop the browse service on Server1 for now, I also found the domain
function level is set to "2000 Mixed" level, I would switch to 2003, but an
intimidating message says to me this action can't be restored, If all my DC
are runnig Win2003 I can switch to 2003 mode without any problem right? or
this may not help to solve my main problem?

Thanks,
Cristian
.



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