Error 0x8024401B

Value: -2145107941 | 0x8024401B | 2149859355

What does it mean ?

WU_E_PT_HTTP_STATUS_PROXY_AUTH_REQ  
HTTP 407 - proxy authentication is required.
Value: 16411 | 0x401B | 0b0100000000011011

Where does it come from ?

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

Other Errors for FACILITY_WINDOWSUPDATE