Windows Server 2008 Time Syncronization

In struggling with time synchronization under Windows 2008 R2, I came across an issue that had me stumped for a bit.  I have a client with Windows 2008 R2 Standard running in a virtual machine in Hyper-v.  I have configured it to sync time from using the w32tm as instructed here, here and here.

The Hyper-v host is getting it’s time reference from the PDC that it is hosting as well.  When the client complained that the time was off by something like 8 minutes, I began checking into the issue.  When running

w32tm /stripchart /computer: target /samples: n /dataonly

I was getting back sporadic 0x800705b4 errors mixed in with the reports that my server was 378.023845629 (or so) seconds off.  I didn’t see reference to that anywhere I Googled.  for it to error every time?  Sure.  Mixed in the same results with successful connections?  Not one.  I checked the firewall settings anyway.  Also, forcing sync had no effect. The clock was still off by three hundred and seventy whatever seconds.

Finally I found my problem.  In integration services, time sync to the host is one of the options.  So I was syncing my host to my PCD which was trying to sync, but being overridden by the integration services and syncing to the host.

Moral?  Virtual machine settings –> Management –> Integration Services –> Time Synchronization?  Uncheck it.

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