Error when applying Server clock drift (powershell)

Is that machine configured to use a 24 hour clock (military time)?

No

Is the error you're receiving persistent for these nodes or does this only occur occasionally?

I can they keep going from green to unknown on several servers.

Is there any common thread between these hosts that are exhibiting the problem? Are they all running the the same operating system version for instance?

We've done some investigation internally and believe the issue is that the default configured NTP server defined in the template is blocking your connection intermittently. If you have many servers configured with this template than it's possible you are exceeding their maximum rate of querying once every 4 seconds on occasion.

All users should ensure that their software NEVER queries a server more frequently than once every 4 seconds. Systems that exceed this rate will be refused service. In extreme cases, systems that exceed this limit may be considered as attempting a denial-of-service attack.

To resolve this issue I recommend changing the time server configured for some nodes to use pool.ntp.org instead.

I tried using pool.ntp.org and recieved the attached error message.

I tried using pool.ntp.org and recieved the attached error message.

Based on the message returned it appears that host is blocking connections. The good news is there's plenty of publicly accessible NTP servers. Below is a list of a few of them from http://tf.nist.gov/tf-cgi/servers.cgi