RSE4007: Aborting client request to backend server '%1' in backend farm '%2' due to unexpected down channel packet opcode %3!4x from the outbound enabler

Error code 4007
Error constant RSE_CLIENT_ABORT_BY_RSOE_PROTOCOL_ERROR
Parameter 1 Backend server name
Parameter 2 Backend farm name
Parameter 3 Down channel packet opcode
 Probable cause