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Can't See MS 2008 R2 In Network Tree

I have a domain with 2 servers running MS Server 2008 R2 (as well as other servers running server 2000, 2003 & 2008, trust me I am trying to get rid of server 200). One of the servers running server 2008 R2 appears in the Network Tree when looking through windows explorer but my newer 2008 R2 server is not appearing.

I have some folder shares on the 2008 R2 that I can access by entering \\server2008r2\share1 but I can't mapped to it through the Network Tree.

Any idea's on what I missed that would cause this server to not appear in the network tree. Note that if I go \\server2008r2 in explorer, the server than appears in the network tree until I reboot my PC. Also if I map the drive to this server, the mapped drive remains after a reboot. I am worried that my other servers/workstations are not seeing this server and that is why I am having difficulties demoting an old server from domain controller status (this new server is taking over as a DC).

Cheers
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IT Project Leader
Commented:
Hello,

The "Network Tree" relies on NetBIOS communication. Ever since Windows 2000, Microsoft has depreciated NetBIOS due to it's security problems and lack of scalability.

Make sure NetBIOS over TCP/IP is enabled on the non-visible server's NIC. If you are going to continue to use the Network Tree, you might want to consider setting up a WINS server, if you haven't already.

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Commented:
Thanks Firebar.