Servers are not appearing in list of network computers

On my client's network, we are running a SBS2011 server and a server 2008 R2 fileserver.  When the Windows 7 workstations go to the Network list (via Computer > Network) the two servers are not showing up, even though you can easily type in the \\servername and browse their resources.  Everything works fine, Outlook, fileshares that are already mapped, etc.  The only indication that something is wrong is that when you click the network link, it shows all of the other network resources EXCEPT for the two servers.
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Digital_SkreamAsked:
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epohlCommented:
On the servers can you verify "Turn on Network Discovery" is selected in the domain profile under Control Panel, network and sharing, advanced sharing settings.
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Digital_SkreamAuthor Commented:
Yes, Under Home/Work, public, and Domain Settings, turn on network discovery is selected.
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epohlCommented:
Are the windows 7 machines joined to the domain ? Are all machines on the same subnet?
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Digital_SkreamAuthor Commented:
Yes.  Everything was working fine, and still does - some of the time.  All machines have the SBS server as their only DNS server, and the SBS server is using the loopback address as its DNS server.
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Skyler KincaidNetwork/Systems EngineerCommented:
I didn't think you could have a full version of Server 2008 and SBS on the same domain? You need to make sure that Network Discovery is enabled and that ICMP traffic is allowed through the Firewall on both servers and the desktops.

ICMP is the protocol used for Network Discovery.
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Digital_SkreamAuthor Commented:
You can have member servers on a SBS domain with no problem.

Interesting point about ICMP... I will check that.
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Skyler KincaidNetwork/Systems EngineerCommented:
Try disabling Windows Firewall on the servers and workstations and see if you are able to see them. Also make sure that NetBIOS is enabled on the NIC of the server and that the Computer Browser service is started.

The computers that you see in Network Neighborhood are created by NetBIOS broadcast. It may be disabled in the TCP/IP settings. Also make sure the NetBIOS name doesn't have any symbols.
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Digital_SkreamAuthor Commented:
In my OP, I had stated Server 2008 R2, SBS 2011, and Windows 7.  None of these use NetBIOS or Computer Browser service - which is what you are referring to.  NETBIOS is not supported by IPv6, which is why in newer OS's, it is disabled.  And, since none of the machines are running legacy OS's such as Windows 2003 or XP, I do not use Computer Browser service... it is disabled on all machines.  AD searches and DNS were intended to replace it in the 2008/Win7 generation of OS and later.  So while I appreciate your response, it doesn't help me with my problem.
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Skyler KincaidNetwork/Systems EngineerCommented:
I appreciate your comment but NetBIOS is still enabled by default in Windows 7 unless you have disabled it through DHCP scope options on your server. You are correct in saying that IPv6 does not support NetBIOS but you can clearly see it is enabled by default by going to the advanced options on your network adapters and looking at the WINS tab.

Why would you have the Computer Browsing service disabled on the two servers and all the workstations? If you enabled it on the servers, start the service and enable it on the computers everything will show up in the "Network" just fine. Are you worried about the NetBIOS broadcast traffic?

The only other thing I can think of would be that the Link-Layer Topology Discovery Mapper I/O Driver and Link-Layer Topology Discovery Responder are not enabled on the network card properties on the servers. If you have those enabled, network discovery turned on, and Windows Firewall is not in the way you shouldn't have any issues.
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Digital_SkreamAuthor Commented:
It is standard practice for Computer Browser service to be disabled - it is the default setting in Server 2008.
I tried enabling computer browser on all machines... it wreaked havoc with the network.

Spent some quality time with the BPA on the DC, and found that some critical updates had been HIDDEN and never installed by the previous admin.  After unhiding and installing them, and nice reboot, the servers have been showing up in the Network and in net view lists without fail.

Don't ask me why he hid them... probably for the same reasons that he migrated them from SBS2003 to SBS2011 by creating a whole new domain, and manually recreating everything in the new domain, rather than just migrating.  still shaking my head over that one.
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Digital_SkreamAuthor Commented:
Even though the answers given did not solve my particular problem, they would have solved it in other circumstances.  partial credit given to multiple people.
Thanks for the assist.
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