Server 2008R2, after we installed the hyperv role, the server clock could not keep the correct time.
Server has been running fine with the correct time for 4+ years. Installed hyperv 2 weeks ago and the clock has been wrong ever since.
Server is the only DC and was set for NTP sync with us.pool.ntp.org, and a few other sources. Seems like everything was fine until we installed hyoperv.
We did all the usual, resync this, change source that, unregister w32tm, all no joy. The only thing that works is to set the server to sync from the cmos battery. This keeps the clock to within 2 minutes, but that isnt really synced.
The real question is why whatever clock the server uses to keep time (it isnt the cmos clock) will not keep time correctly.
Open to suggestions.