Error 0x83760003

Value: -2089418749 | 0x83760003 | 2205548547

What does it mean ?

E_PROTOCOL_EXTENSIONS_NOT_SUPPORTED  
Protocol extensions are not supported.
Value: 3 | 0x0003 | 0b0000000000000011

Where does it come from ?

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

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