HRESULT 0xC121010B (WDSMCS_E_START_TIME_IN

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Description:

The scheduled start time is in the past.

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WDSMCS_E_NS_START_FAILED_NO_CLIENTS	WDSMCS_E_PACKET_NOT_HASHED

WDSMCS_E_START_TIME_IN_PAST

WDSMCS_E_START_TIME_IN_PAST is a Windows Deployment Services (WDS) Multicast Server result. It indicates that a scheduled transmission uses a start time earlier than the server considers valid.

What to check

Validate the timestamp, time zone conversion, and server clock before registering the namespace.
Use a future start time with enough margin for clients to join and configuration to replicate.
Check time synchronization on the server and management host when correct local times still fail.

Microsoft documentation on the Windows Deployment Services Multicast Application Protocol

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