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Event ID: 56 Source: w32time

Source
Level
Description
The Domain Controller \\<computer host name> (<IP address>) in <domain name> returned an incorrectly signed time stamp. If this DC is from the machine's parent domain then the trust link between the domains may be broken and must be fixed. If the DC is from this machine's own domain, then the machine password for this machine is incorrect and should be corrected.
Comments
 
As per Microsoft: "This problem can occur when the secure channel password between the child domain controller and its parent domain controller is not updated properly". See ME278385 for more details.
This behavior can occur if a client computer in the trusting domain performs a secure time synchronization with a domain controller (DC) in the trusted domain by using an expired trust password. See ME294834 for more details.

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