Strange networking problem with Win2K Server

[Roman]

I have a WIN2K Server PDC with SP3 on a network with 10 computers, all
running XP Pro. My Internet connection is a DSL with a Netgear
RP614v2 Router that serves as a DHCP Server, NAT firewall and port
forwarding.

Here's the problem: If I log onto the W2K server after restarting it,
the computers including the server, are no longer able to access any
of the WAN addresses through HTTP or other protocols (such as mail),
until I reboot the W2K server. If I don't log on to the W2K server
after reboot, everything works perfectly.

WAN connection is not the problem, because I can still ping any
address even after logging onto the server. I removed port forwarding
and it didn't make any difference, either. A clue might be the fact
that the incoming connections (such as HTTP and mail protocols) work
at all times, even with ports forwarded to the W2K Server.

Any idea what the log in process might be starting that somehow ruins
everything?

 

[Marina Roos]

How many nics in the server? Does the ipconfig/all from the clients show
that everything is pointing to your server-IP?
Got the ms03-039 installed on the server and clients?

Marina

 

[ROMAN SHULOV]

There's 1 nic in the server. The Win2K server is only used as a DNS and
WINS server, which shows up in the ipconfig /all. ms03-039 is installed on
clients and server.

 

[Scooter]

Does the server have multiple ips on it? If it has an ip
that is shared with the netgear external ip that can cause
problems.

 

[Marina Roos]

W2K-server is much happier if it runs DHCP-server. DHCP scope options then
can be set for 003, 006, 015, 044 and 046 (0x8), which will be pushed to
your clients if they are set to obtain an IP and DNS from your DHCP-server
automatically.

Marina

 

[Roman]

Just a single IP.

Does the server have multiple ips on it? If it has an ip
that is shared with the netgear external ip that can cause
problems.