Geir Guldstein wrote:
On 24.01.2012 16:02, Martin Burnicki wrote:
Geir,
Geir Guldstein wrote:
The driver provides support for serial ports physically located in an
external device. The device is connected to the host computer using
Ethernet. I have seen that installing the driver is enough to cause the
NTP problem. That is, even if the device is disconnected from the
network and no application uses the serial ports I have the NTP problem.
Currently I know 2 other users which observe similar problems under
Windows Server 2008, one system is 32 bit and the other one is R2 with
64 bit.
Would you mind to let us know exactly which driver/manufacturer causes
this, so we can find out if the same driver causes this for the other
guys?
Martin
I supply the following information with permission from Comtrol (the
device/driver vendor, www.comtrol.com).
Device: Comtrol DeviceMaster RTS 32-Port
Driver: NS-Link v8.16
I received excellent support from Comtrol after creating my support
case. The problem was solved in less than 24 hours after I submitted my
case. According to Comtrol the root cause is an OS API problem that
Microsoft eventually should fix. The solution for the v8.16 driver was
to delete the driver's ScanRate key in the registry (location for x64
OS: HKLM\SYSTEM\CurrentControlSet\services\rpshsix64\parameters, for x86
OS: HKLM\SYSTEM\CurrentControlSet\services\rpshsi\parameters). Comtrol
will soon release an updated driver that fixes the problem permanently
without requiring the registry change. They will then also post
additional information on http://forum.comtrol.com/.
Hey, that's great. Thanks for the information.
In the meantime one of the users I'm in contact with has found out that
current versions of the Nvidia graphics driver NVS 300 caused the
problem. After the driver had been deinstalled the time could be
properly disciplined by ntpd on Windows Server 2008 (32 Bit).
The remaining questions are still if the root of the problem is inside
the Windows kernel, and just start to appear if certain API functions
are called by the drivers mentioned here.
Martin
--
Martin Burnicki
Meinberg Funkuhren
Bad Pyrmont
Germany
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