I’ve been seeing this error on one of our domain controllers for awhile.
It’s a not a big deal, but annoying so I looked at fixing it today. Found this page about it and looked in the registry to check the settings it walks your through. The only thing that I needed to change was adding ,0x1 to the end of the servers since we weren’t using the IP addresses. I’ll check on it later to see if the error is still popping up.
This registry entry specifies a space-delimited list of stratum 1 time servers from which the local computer can obtain reliable time stamps. The list may consist of one or more DNS names or IP addresses (if DNS names are used then you must append ,0x1 to the end of each DNS name). For example, to synchronize the PDC Emulator in your forest root domain with tock.usno.navy.mil, an open-access SNTP time server run by the United States Naval Observatory, change the value of the NtpServer registry entry from time.windows.com,0x1 to tock.usno.navy.mil,0x1 here. Alternatively, you can specify the IP address of this time server, which is 220.127.116.11 instead.