HRESULT 0xC121010A (WDSMCS_E_NS_START_FAILED_NO

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Constant name:

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Description:

The namespace cannot start without clients.

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WDSMCS_E_NAMESPACE_ALREADY_STARTED	WDSMCS_E_START_TIME_IN_PAST

WDSMCS_E_NS_START_FAILED_NO_CLIENTS

WDSMCS_E_NS_START_FAILED_NO_CLIENTS is a Windows Deployment Services (WDS) Multicast Server result. It indicates that the configured start policy requires at least one client, but no client has joined the namespace.

What to check

Verify that PXE or multicast clients can discover, join, and remain connected to the namespace.
Check the namespace start policy and scheduled-cast thresholds before requesting a start.
Investigate network reachability, multicast routing, and client authentication if clients never appear.

Microsoft documentation on the Windows Deployment Services Multicast Application Protocol

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