Error 0x83760004

Value: -2089418748 | 0x83760004 | 2205548548

What does it mean ?

E_SUBPROTOCOL_NOT_SUPPORTED  
Subrotocol is not supported.
Value: 4 | 0x0004 | 0b0000000000000100

Where does it come from ?

FACILITY_WEB_SOCKET  
WebSocket protocol
Value: 886 | 0x376 | 0b1101110110

StackOverflow

Other Errors for FACILITY_WEB_SOCKET