Servers not showing up in Network Neighborhood

I have two Server 2003 r2 servers in a workgroup called WORKGROUP.  However, they do not appear in the network neighborhood and I have a vendor that insists that it must appear there for their backup solution to work.

I have done the usual things: computer browser, workstation, and server services are ON; NetBIOS over TCP/IP is ENABLED.  Firewall is turned OFF.  NIC drivers updates. Windows OS updated.  I have looked for a third party firewall that may be interfering but cannot find one. There is no endpoint security software installed that might be causing the issue.  I have scanned both machines for malware/viruses (NONE found).

Both servers are configured to use a WINS server. Both servers appear in the WINS server tables.

DNS is configured correctly (as far as I can tell).

I can open a command prompt and ping the servers using their servername.  I can open an explorer tree and type \\servername and get to the shared folders AND the server will appear in the workgroup until I close the window.
mednetAsked:
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pwindellCommented:
I can open a command prompt and ping the servers using their servername.  I can open an explorer tree and type \\servername and get to the shared folders AND the server will appear in the workgroup until I close the window.

That should be all you need.  The vendor is most likely simply wrong.   I run into this quite often with vendors who have no where near the correct networking knowledge that they should have to do their jobs.

The Vendor's product is not going to be looking at the Master Browser List on the Master Browser to find the machine it has to work with (I have never ever ever found one that actually does that).  What it will need to do is be able to resolve the machine name to an IP#,...and from what you describe,...you already have that.
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