Error 0x80244020

Value: -2145107936 | 0x80244020 | 2149859360

What does it mean ?

WU_E_PT_HTTP_STATUS_NOT_SUPPORTED  
HTTP 501 - server does not support the functionality that is required to fulfill the request.
Value: 16416 | 0x4020 | 0b0100000000100000

Where does it come from ?

FACILITY_WINDOWSUPDATE  
Windows update
Value: 36 | 0x024 | 0b00100100

Other Errors for FACILITY_WINDOWSUPDATE