What does HRESULT 0xC1100122 (WDSTPTMGMT_E_TFTP_VAR_WINDOW_NOT_SUPPORTED) mean?

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The selected WDS Transport Server does not support the TFTP variable window extension.

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WDSTPTMGMT_E_TFTP_MAX_BLOCKSIZE_NOT_SUPPORTED	WDSTPTMGMT_E_INVALID_TFTP_MAX_BLOCKSIZE

WDSTPTMGMT_E_TFTP_VAR_WINDOW_NOT_SUPPORTED

WDSTPTMGMT_E_TFTP_VAR_WINDOW_NOT_SUPPORTED is a Windows Deployment Services Transport Management result. It indicates that the WDS TFTP server cannot enable the requested variable-window extension.

What to check for WDSTPTMGMT_E_TFTP_VAR_WINDOW_NOT_SUPPORTED

Check WDS TFTP feature support on the target server before enabling the variable-window extension.
Use standard TFTP window behavior when this extension is unavailable.
Test PXE boot clients after changing TFTP extensions because client firmware support can vary.

Microsoft documentation on Windows Deployment Services and the WDS Transport Management API

Verification: Capture the exact API call and input state that reports wdstptmgmt e tftp var window not supported, then repeat the operation after changing only that condition.

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