VM server does not always appear in AD.

On occasion one of our VM servers is not always listed in AD when I do a Network search.
It is functioning properly.  It's a 2008 R2

How do I trouble shoot this?
J.R. SitmanIT DirectorAsked:
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Raj-GTConnect With a Mentor Systems EngineerCommented:
Also if you haven't already, enable netbios over tcp on the vm nic properties.
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Raj-GTSystems EngineerCommented:
It is impossible for an object to drop in and out of AD like this. How exactly are you querying the AD?
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J.R. SitmanIT DirectorAuthor Commented:
I can tell you that it is possible.  From a server, I simply click on the network icon.  All computers and server display, except this one.
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MaheshArchitectCommented:
Is this server and VM host subnet id different from DC and is it separated by VLAN ID ?

Does there other virtual servers on VM host get discovered or none of them ?

If other servers are discovered on VM host then problem exists with this server only

Ensure that network discovery is enabled on this server, and also check if workstation and Tcp IP helper service is running in automatic mode

Mahesh
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Cliff GaliherCommented:
The "network" icon is *not* necessarily Active Directory. It shows machines that are visible to the network discovery service. That can be blocked by firewall software, DNS changes, and a variety of other things.

The short version is that the whole network browser component of Windows is there for legacy applications (and users) to use, but does rely on older technologies that are being phased out. If you want reliable access to a resource such as a printer or a file-share, you would publish that in Active Directory. Then you don't need to browse to a machine first. But as a previous poster commented, the machine doesn't (and isn't) dropping in and out of Active Directory now. It is only dropping out of the network browser, which is unrelated.
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J.R. SitmanIT DirectorAuthor Commented:
That is very helpful.  Do you have a link for "publishing in AD"?
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J.R. SitmanIT DirectorAuthor Commented:
@Mahesh  I will check these later today.
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J.R. SitmanIT DirectorAuthor Commented:
Network discovery is on and both services are running.  Also I read the article about publishing and it states computers and servers are automatically published.
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MaheshArchitectCommented:
Just try to disable antivirus software on server and check from client computer \ DC if it is discoverable ?
May be antivirus blocks the broadcast

Mahesh
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J.R. SitmanIT DirectorAuthor Commented:
I enabled the netbios over tcp.  Still testing
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J.R. SitmanIT DirectorAuthor Commented:
It seems that with netbios over tcp on, the problem is solved.

Thanks
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J.R. SitmanIT DirectorAuthor Commented:
Thanks
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