What does Windows error code 171 (ERROR_DEVICE_SUPPORT_IN_PROGRESS) mean?

 
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ERROR_DEVICE_SUPPORT_IN_PROGRESS

Device capability detection is still running

ERROR_DEVICE_SUPPORT_IN_PROGRESS is a Win32 result associated with device capability discovery or command-support probing.

What the result means

Windows is still detecting whether the device supports the requested command.

What to check

  • Wait for the capability query to finish before issuing the dependent request.
  • Keep the device handle and device instance identity stable while detection is in progress.
  • Check for repeated device arrival/removal events or driver restarts that continually reset detection.
  • Record the command, device interface path, driver version, and elapsed detection time.

Recommended handling

Treat this as a transient state only when the driver documents that capability detection completes asynchronously. Use a bounded retry with cancellation support; do not spin continuously or assume support before detection finishes.

References


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