Error 0x803D001E

Value: -2143485922 | 0x803D001E | 2151481374

What does it mean ?

WS_E_SERVER_REQUIRES_NTLM_AUTH  
The remote endpoint requires HTTP authentication scheme 'NTLM'.
Value: 30 | 0x001E | 0b0000000000011110

Where does it come from ?

FACILITY_WEBSERVICES  
Web Services
Value: 61 | 0x03D | 0b00111101

Other Errors for FACILITY_WEBSERVICES