Error 0x803D001C

Value: -2143485924 | 0x803D001C | 2151481372

What does it mean ?

WS_E_SERVER_REQUIRES_BASIC_AUTH  
The remote endpoint requires HTTP authentication scheme 'basic'.
Value: 28 | 0x001C | 0b0000000000011100

Where does it come from ?

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

Other Errors for FACILITY_WEBSERVICES