Time on servers and computers is six minutes behind

Hi,

We have a few servers and tens of computers syncing with PDC emulator which is our Exchange server 2007 running windows server 2008. But I found all PCs and server are 6 minutes behind. How can I sync the time correctly?
EducadAsked:
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David Johnson, CD, MVPOwnerCommented:
sync the pdc to an authoritative source i.e. pool.ntp.org

sc stop w32time
w32tm /config /syncfromflags:manual /manualpeerlist: "0.ntp.pool.org,0x1 1.ntp.pool.org,0x1 2.ntp.pool.org,0x1" /reliable:yes /update 
sc start w32time

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Sajid Shaik MSr. System AdminCommented:
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Minecraft_ EndermanCommented:
Perhaps this KB will be helpful for you.

http://support.microsoft.com/en-us/kb/555225
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albatros99Commented:
The question would be if the time on the PDC is also 6 minutes behind. It might just be case of setting up the PDC to sync with an external time source.  (see previous comments)

If the PDC has the correct time and the clients and servers have the wrong time even after restarting time service, then they are either not synchronizing with the PDC or they are not accepintg the PDC as a reliable time source.
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EducadAuthor Commented:
Yes, PDC is also 6 minutes behind, I put the command and restarted w32time service but nothing seems to have changed? Still 6 minutes behind..
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albatros99Commented:
NTP is port 123.... Is the PDC allowed to access the external time servers on port 123?
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EducadAuthor Commented:
I can see some traffic from PDC are blocked by firewall, but sorce port is 55771 not port 123?

For example, 192.168.10.1:55771 -> 192.189.54.17:123 this traffic is being blocked.
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albatros99Commented:
Yes... Source port will be random but destination port is 123. So there's your problem - you need to open port 123 on the firewall.
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EducadAuthor Commented:
is it safe to open port 123 for any destination IP addresses?
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David Johnson, CD, MVPOwnerCommented:
yes, unless you have a security policy that forbids it. I'd restrict it to private ip addresses i.e. 192.168.0.0/16
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albatros99Commented:
I would restrict the source address for the rule to the PDC so that the clients don't start setting up their own NTP settings.

So in other words: PDC IP address to Internet 123 (Outbound) allowed
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tigermattCommented:
We have a few servers and tens of computers syncing with PDC emulator
How is this configured? Have you manually entered NTP server settings on each workstation (which would not be in keeping with proper process) or are you allowing them to automatically seek a suitable NTP server via the domain hierarchy?
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EducadAuthor Commented:
Tigermatt,

No I did not enter NTP server settings on each PC, I prefer them to get the correct time from PDC emulator within the domain hierarchy. What would be the best way for PCs to synchronize time?
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HariomExchange ExpertsCommented:
The DC will synchronize from  external time source.

http://support.microsoft.com/en-us/kb/816042

The client should sync from DC

https://technet.microsoft.com/en-us/library/cc758905(v=ws.10).aspx

Manually sync w32tm /resync /rediscover check system eventviewer it will record event.
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tigermattCommented:
No I did not enter NTP server settings on each PC, I prefer them to get the correct time from PDC emulator within the domain hierarchy. What would be the best way for PCs to synchronize time?
Yes, that's the proper method; setting NTP settings manually on the PCs as a stop-gap measure is a common problem which will come back to bite in the long run. :-)
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Windows Server 2008

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