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Event ID: 21 Source: Microsoft-Windows-Time-Service

Level
Description
The time service is configured to use one or more input providers, however, none of the input providers are available. The time service has no source of accurate time.
Comments
 
T756431 indicates that when this error is recorded, the configuration of the time source (also known as the time provider) is not valid, or the time source is no longer accessible. The solution is to reconfigure the time service to use a reliable time source.

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