Hello,
We are running Windows Server 2008 R2 Datacenter for our Hyper-V server. This server has been running well, and we have around 30 VMs running it on. Recently however we have noticed that VMs are no longer able to activate Windows, and instead we get a 0x8007007B error within the Windows Activation window, with the more details stating that "The filename, directory name, or volume label syntax is incorrect". This behavior is the same on any new VMs we try to build, and needless to say it is becoming increasingly problematic.
That error in a normal OS install would apparently point to a DNS issue. However, from what I understand of Hyper-V VM activation the Data Exchange portion of the Integration Services intercepts these activations, and instead routes them to the host server. This has made researching this issue very difficult given that the majority of what I find seems inapplicable, and am hoping someone who knows more of how Hyper-V VMs activate windows might be able to help me out.
I haven't done a ton of troubleshooting, short of rebooting the host server. The logs of the host and virtual servers don't seem to indicate any problems.