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XenApp/PVS weired time sync problems after CTX235405 XenIface Windows I/O driver

Filip Fronczak


After installing https://support.citrix.com/article/CTX235405 update we are experiencing:

  1. Often (every 30 minutes) time sync updates on all VM (this is kind of expected...)
  2. XenApp servers (Win2008R2), which run from PVS are synchronising the time completely wrong:

    The system time has changed to 2019-08-22T12:41:28.349000000Z from 2019-08-22T10:53:28.354651100Z.

    Change Reason: An application or system component changed the time.

    As you see the time difference is 1h 48mins!!!

    and then:

    The time provider NtpClient is currently receiving valid time data from 0.pl.pool.ntp.org,0x9 (ntp.m|0x9|>

    The time service is now synchronizing the system time with the time source 0.pl.pool.ntp.org,0x9 (ntp.m|0x9|>

    The time service is now synchronizing the system time with the time source ???-??-DC01.???????.local (ntp.d|>


As a result the time is changing back and forth. Another weird thing is the source 0.pl.pool.ntp.org. Where is this source coming from? We have not provided this address in any config.


Is there any easy way to uninstall this update? Or to change it's behaviour? 


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2 hours ago, Alan Lantz said:

Changing NTP Sources



Latest version was released a couple of months ago. There is a link in this to registry 

changes people have been making to fix NTP issues.





Thank you. I know how to change NTP source on XenServer. It's abut a Windows Guest VM. Like I said we are not using those NTP servers anywhere.


Second link is somehow helpful - it describes exactly our issue. Still no final resolution.



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Hmmm... the default for a VM is to sync its time with the XenServer pool master, if NTP has not explicitly been configured on the VM.

A major time offset is nearly always due to a time zone mismatch. That said, if the time is way off, it will likely not ever synchronize on its own unless manually set to be close to the true time.



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