Solution : https://service.sap.com/sap/support/notes/314530 (SAP Service marketplace login required)
Summary : 
      
Key words : 
external rfc/cpic server, cpic/rfc server programs, rfc server program, local hosterror       max, rfcserver program registers, manage multiple connections, environment variables cpic_max_conv, open additional connections, server program, location    cpic
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