Can't see certain computers??

This is driving me nuts, I'm not sure what happened.

I have a Win2k3 Server and several PCs hanging off the peer-to-peer network.
All computers could see each other and all was grand. However several
things occurred at once - we demoted the server from active directory domain
to a general file server and inserted a wireless router.

I"m pretty sure all is back to normal now - the network is still no longer a
domain, but the wireless router has been taken out of the picture.

Some computers can see others, but not all. One computer says the workgroup
no longer exists. My laptop can see all other computers but the server -
the important one.

I don't get it. DNS? Firewall?

I've tried disabling all computers' firewalls but still no go. Setup
matching user accounts/passwords on each computer, still no go.

Can you folks help me out here? Ask me some questions, I'll answer and
maybe find the resolution. I'm at a complete loss here - and feel I've
tried everything.

Thanks in advance, -Mike

Can the computers ping the servers they can not see by name or IP address??
Can they connect to them by using \\computername\sharename or
\\xxx.xxx.xxx.xxx\sharename where xxx.xxx.xxx.xxx is the IP of the computer
with the share?? Are these computers all on the same network [no real
routers]? More than likely something has gone awry with the master browser.
One thing to also try is to disable the computer browser service on any
computer that has more than one nic or is a remote access server as any
master browser that is multihomed will usually provide problems with the
browse list. Since you rely on Network Places I would also use wins on the
network and make sure that the wins server and all other computers are wins
clients. Run nbtstat -n on the Windows 2003 Server to make sure it shows at
least three registered netbios names. Any enabled personal or built in
firewalls will cause problems with the browse list. The link below may be
helpful. -- Steve

http://support.microsoft.com/default...b;EN-US;188305 -- "browstat
status" will display master browser.
http://support.microsoft.com/default...b;en-us;135404

"mikeb" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
> This is driving me nuts, I'm not sure what happened.
>
> I have a Win2k3 Server and several PCs hanging off the peer-to-peer
> network. All computers could see each other and all was grand. However
> several things occurred at once - we demoted the server from active
> directory domain to a general file server and inserted a wireless router.
>
> I"m pretty sure all is back to normal now - the network is still no longer
> a domain, but the wireless router has been taken out of the picture.
>
> Some computers can see others, but not all. One computer says the
> workgroup no longer exists. My laptop can see all other computers but the
> server - the important one.
>
> I don't get it. DNS? Firewall?
>
> I've tried disabling all computers' firewalls but still no go. Setup
> matching user accounts/passwords on each computer, still no go.
>
> Can you folks help me out here? Ask me some questions, I'll answer and
> maybe find the resolution. I'm at a complete loss here - and feel I've
> tried everything.
>
> Thanks in advance, -Mike
>