Error 0x83760002

Value: -2089418750 | 0x83760002 | 2205548546

What does it mean ?

E_INVALID_PROTOCOL_FORMAT  
Invalid data format for the specific protocol operation.
Value: 2 | 0x0002 | 0b0000000000000010

Where does it come from ?

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

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