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WDSTPTMGMT_E_INVALID_TFTP_MAX_BLOCKSIZE
WDSTPTMGMT_E_INVALID_TFTP_MAX_BLOCKSIZE is a Windows Deployment Services Transport Management result. It indicates that the supplied maximum TFTP block size is neither zero nor within the allowed 512 through 65531 byte range.
What to check
- Set the value to zero for the default or to a value from 512 through 65531 bytes.
- Confirm that the selected block size is compatible with PXE clients, network MTU, and intervening devices.
- Apply the smallest change needed and test boot reliability before rolling the setting out broadly.
Microsoft documentation on Windows Deployment Services and the WDS Transport Management API
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