ERROR_NTLM_BLOCKED 0x80070791

Error code 1937 · HRESULT 0x80070791

WINDOWS

Authentication failed because NTLM authentication has been disabled.

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_NTLM_BLOCKED is a Windows error code (system error 1937, returned as HRESULT 0x80070791) reported by Windows. Its official message is: “Authentication failed because NTLM authentication has been disabled.”

How to fix ERROR_NTLM_BLOCKED

  1. Run the affected program as administrator (right-click → Run as administrator)
  2. Check permissions on the target resource: Properties → Security → your account
  3. Check Event Viewer → Windows Logs → Security for the matching audit entry

Related errors

ERROR_REMOTE_PRINT_CONNECTIONS_BLOCKEDERROR_PASSWORD_CHANGE_REQUIREDERROR_AUTHENTICATION_FIREWALL_FAILEDSTATUS_ACCESS_DENIEDSTATUS_INVALID_IMAGE_FORMATSTATUS_STACK_OVERFLOWSTATUS_DLL_NOT_FOUNDSTATUS_ENTRYPOINT_NOT_FOUND

Source: Microsoft WinError.h

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