Question

How do I configure a Windows 2008 sntp time server?

Asked by: Biziteks

Have a Windows 2008 Hyper-V host server running a DC in a VM. That DC is the Time Server (SNTP) for the network and all PCs get told to look at the server and sync with it in their login script.

The time difference between my time server and the external source on this network increases slowly over time instead of staying in sync. I'm not having this problem on any other non-2008 network that I've setup in the past several years. Is there something different about 2008?

Steps for setting an external source on the Time Server that I used:
Step 1:
   Net time /setsntp:tick.usno.navy.mil
   W32tm /config /syncfromflags:manual /manualpeerlist:tick.usno.navy.mil
   W32tm /config /reliable:yes
   W32tm /config /update
   W32tm /resync
   Pause
   Exit

Step 2:
   [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config]
   "AnnounceFlags"=dword:00000005
   [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters]
   "Type"="NTP"
   [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpServer]
   "Enabled"=dword:00000001

Step 3:
   Net stop w32time
   Net start w32time
   Net time
   Pause
   Exit

Command in login script:
Net Time \\<LocalTimeServer'sName /Set /Yes

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Asked On
2008-12-09 at 12:30:08ID23970472
Tags

Microsoft

,

Windows Server

,

2008

,

SNTP Time Server

Topics

Windows Server 2008

,

Hypervisor

,

Windows Networking

Participating Experts
2
Points
500
Comments
5

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Answers

 

by: mkbeanPosted on 2008-12-09 at 12:48:58ID: 23133522

I use a combination of the commands you use for syncing time.  My first step looks like this: W32tm /config /manualpeerlist:peers /syncfromflags:manual /reliable:yes /update

Have you read through this thread on VMWare's site?
http://communities.vmware.com/docs/DOC-5961

Also another great blog post on a similar issue - http://timjacobs.blogspot.com/2007/11/virtualized-domain-controllers-time.html

Brian

 

by: BiziteksPosted on 2008-12-09 at 14:34:59ID: 31524348

You led me down the path to fixing this. It was a time synchronization loop between the vitrual PDC Emulator and the host OS.

 

by: BiziteksPosted on 2008-12-09 at 14:38:36ID: 23134596

The commands I was putting in were fine. The issue was a time synchronization loop between the virtual DC with the PDC Emulator FSMO role that I was using as the Time Server for the network and it's host OS. I had to Disable the Hyper-V Time Synchronization service in the guest OS to prevent the time from changing back to the incorrect time after I would do a sync and the correct time would appear for 1-2 seconds. mkbean's links led me to correct answer.

 

by: mkbeanPosted on 2008-12-09 at 15:38:55ID: 23134985

Glad to have helped you down the path to resolution.

Brian

 

by: cadnycPosted on 2011-03-15 at 11:42:04ID: 35141120

20120131-EE-VQP-002

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