ERROR_CS_ENCRYPTION_INVALID_SERVER_RESPONSE 0x80071781

Error code 6017 · HRESULT 0x80071781

WINDOWS

The remote server sent an invalid response for a file being opened with Client Side Encryption.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

ERROR_CS_ENCRYPTION_INVALID_SERVER_RESPONSE is a Windows error code (system error 6017, returned as HRESULT 0x80071781) reported by Windows. Its official message is: “The remote server sent an invalid response for a file being opened with Client Side Encryption.”

How to fix ERROR_CS_ENCRYPTION_INVALID_SERVER_RESPONSE

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

ERROR_CS_ENCRYPTION_UNSUPPORTED_SERVERERROR_CS_ENCRYPTION_EXISTING_ENCRYPTED_FILEERROR_CS_ENCRYPTION_NEW_ENCRYPTED_FILEERROR_CS_ENCRYPTION_FILE_NOT_CSEERROR_EFS_VERSION_NOT_SUPPORTERROR_EFS_DISABLEDERROR_VOLUME_NOT_SUPPORT_EFS

Source: Microsoft WinError.h

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