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Windows 7 x64 machines unable to access single fileshare on server by netbios name

We have a very strange problem we have just commissioned a new data server running Windows Server 2008 R2 (It is a VM running on Citrix Xenserver 6.0.2)

We have some Windows 7 x64 machines that refuse to connect to a single share on this server but only when the netbios name is used.

For example if someone from an affected machine tries to connect to
\\SERVERNAME\share$ they get an access is denied error
if they access \\SERVERNAME.domain.local\share$ or \\SERVERIP\Share$ they can access the share no problem. They can also access any other share from the server using a netbios name without issue (including if the same folder is reshared with a different name.)

The issue is PC specific and not dependant on who is logged in. Share permissions are all users Full Access and NTFS permissions allow everyone read/write access (which is verified by the fact it is accessible by accessing the same share but using the servers FQDN.)

The share in particular is being used for user accounts redirected folders (start menu, application data, desktop etc.)

For the moment I am updating GPO's to use the FQDN but to me this is working around the issue instead of resolving it.
Microsoft Legacy OS

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8/22/2022 - Mon

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Davis McCarn

In a CMD window, try PING <servername>, PING <FQDN-servername>, and PING <ip-address>.
2 & 3 should give you the same results; but, is the ip of <servername> different?
If so, go to your DNS server and add the computer as a record.

Hi, yes all 3 resolve to the same IP. Please note this is only affecting one share on a server that hosts many. So the affected clients can access different shares on the same server.

Also as a further update as of yesterday afternoon some of the afflicted PC's are also unable to connect via FQDN to this particular share. So now
\\servername\share$ gives an access denied
\\servername.domainname.local\share$ gives an access denied
\\IPADDRESS\share$ works

So the issue appears to be progressing, also after taking a tally of the affected machines the only ones affected are Windows 7x64 machines that are in branch offices (Windows 7 x64 machines in the same office as the file server work without issue as does all Windows XP machines regardless of physical location. All branch offices are connected to the central office by way of IPSEC VPN's hosted on SonicWALL UTM units (nothing is showing in the logs of these that might suggest something is being blocked and for good measure we have temporarily disabled any of the UTM features of these units to ensure Gateway AV or Intrusion prevention was preventing access, so far this does not appear to change anything.
Davis McCarn

Go to the network properties on one of the affected machines and uncheck IPV6 as a test.
This is the best money I have ever spent. I cannot not tell you how many times these folks have saved my bacon. I learn so much from the contributors.

No change with disabling IP v6, at the moment we have reimaged one of the affected machines and it seems to be playing ball, that said I would still like to find the root cause just in case this crops up again I would like to avoid reimaging every single time.

Did you look at my post?