About half of our DC's are one hour behind. All are running Server 2003, including the NTP server (DC1). All servers are in the same AD group with the same policies. It happened about 2 weeks ago, at the same time according to the System Event Logs. Please see logs below:The time provider
Event ID: 25
NtpClient cannot determine whether the response received from dc1.domain.com has a valid signature. The response will be ignored. The error was: The interface is unknown. (0x800706B5)
Event ID: 22
The time provider NtpServer encountered an error while digitally signing the NTP response for peer xxx.xxx.xxx.157:123. NtpServer cannot provide secure (signed) time to the client and will ignore the request. The error was: The interface is unknown. (0x800706B5)
It doesn't make sense that half of the servers are correct and half are an hour behind, when they all have the same NTP server. One server gives an Information Event Log that says it is recieving the correct time from DC1, but it is still an hour behind.
Any suggestions?
Thanks, Josh.