Unable to browse to QNAP NAS from Windows Server 2008 R2 “The specified network name is no longer available.”

Problem

I have a small network consisting of an AD domain controller, QNAP and ESX. I deploy my VMs using WDS. I found that some of my Windows Server 2008 servers, were unable to navigate to the QNAP windows shares either via mapping a drive or the UNC path, despite being able to ping and navigate to served web pages.

The specified network name is no longer available.

Solution

After a lot of hunting high and low, I found an article relating to something else (that I can’t find now) that suggested changing some GPO settings. Sure enough, on my Windows 7 laptop and the physical DC, the local group policy had these settings. After applying the GPO to the problematic servers the issue was resolved.

In a GPO applied to the machine accounts, the following settings were changed from Not configured, to:
Microsoft Network Client:-
Microsoft network client: Digitally sign communications (always)   Disabled
Microsoft network client: Digitally sign communications (if server agrees)   Enabled
Microsoft Network Server:-
Microsoft network server: Digitally sign communications (always)   Disabled
Microsoft network server: Digitally sign communications (if server agrees)   Enabled
As a matter of course, I always do a gpupdate /force. This one needed a reboot too.

2 thoughts on “Unable to browse to QNAP NAS from Windows Server 2008 R2 “The specified network name is no longer available.”

  1. Stu

    Hi – having this exact problem on a server 2012 R2 but your post seems to be missing what you changed?

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