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WDSMCS_E_REQCALLBACKS_NOT_REG
WDSMCS_E_REQCALLBACKS_NOT_REG is a Windows Deployment Services (WDS) Multicast Server result. It indicates that provider initialization completed without registering callbacks required by the multicast server.
What to check for WDSMCS_E_REQCALLBACKS_NOT_REG
- Check the provider initialization path and verify each required callback registration succeeds.
- Confirm that the provider was built against an interface version compatible with the target server.
- Inspect the provider-specific error returned before this result instead of retrying registration blindly.
For WDSMCS_E_REQCALLBACKS_NOT_REG, Microsoft documentation on the Windows Deployment Services Multicast Application Protocol
Diagnostic interpretation of WDSMCS_E_REQCALLBACKS_NOT_REG
WDSMCS_E_REQCALLBACKS_NOT_REG has the HRESULT value 0xC1210101. AllStat records the condition as “The Content Provider did not register required callbacks.”. For WDSMCS_E_REQCALLBACKS_NOT_REG, in practice, interpret that wording at the boundary owned by Windows Deployment Services, rather than treating the value as a generic Windows message.
Evidence to capture for WDSMCS_E_REQCALLBACKS_NOT_REG
- Record the exact COM method or Windows API, its input object, the calling thread, and the full 0xC1210101 value before a wrapper converts it to an exception or Boolean result.
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions WDSMCS_E_REQCALLBACKS_NOT_REG or the wdsmcs / reqcallbacks / reg operation.
- Preserve the first failure in the call chain; a later HRESULT can describe cleanup rather than the original wdsmcs / reqcallbacks / reg condition.
Retry and recovery for WDSMCS_E_REQCALLBACKS_NOT_REG
Retry WDSMCS_E_REQCALLBACKS_NOT_REG only when the owning API documents a transient state or after the condition described as “The Content Provider did not register required callbacks.” has changed. For WDSMCS_E_REQCALLBACKS_NOT_REG, configuration, policy, format, and authorization failures normally require correction first; an immediate loop can hide the original call site and add secondary errors.
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