What does HRESULT 0xC121010F (WDSMCS_E_PACKET_NOT_CHECKSUMED) mean?

 
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WDSMCS_E_PACKET_NOT_CHECKSUMED

WDSMCS_E_PACKET_NOT_CHECKSUMED is a Windows Deployment Services (WDS) Multicast Server result. It indicates that the received packet lacks a required checksum, preventing the receiver from performing the expected integrity check.

What to check

  • Verify the provider and client protocol settings that control checksum generation and validation.
  • Confirm that both sides use a compatible packet format and no older provider is still deployed.
  • Inspect controlled packet captures for truncation or transformation by the network path.

Microsoft documentation on the Windows Deployment Services Multicast Application Protocol


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