Solution : https://service.sap.com/sap/support/notes/807000 (SAP Service marketplace login required)
Key words : 
left pane           cluster-data -> global server configuration -> services -> http   3, including load test scenarios, receive error http response - 500, http client establishes connection, read <read-bytes> bytes, http client machine, increased resource usage, synchronization error reason, clients randomly fail, apply section ii
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