JCO_COMMUNICATION_FAILURE - CPI-C errors

Hi,
I'm getting some errors in XI but not always, I think it's when the server is on heavy load:
<SAP:Code area="MAPPING">JCO_COMMUNICATION_FAILURE</SAP:Code>
<SAP:P1>Error opening an RFC connection.</SAP:P1>
In sm21, I see:
14:45:55 RD                            S23 Connection to CPI-C client 351 was closed
14:45:55 RD                            S74 > Partner LU name:
14:45:55 RD                            S0R > Host: r1n0v3
14:45:55 RD                            S0I > Partner TP Name: jlaunch
14:45:55 DIA 003 700 SAPJSF R49 Communication error, CPIC return code 020, SAP return code 223
14:45:55 DIA 003 700 SAPJSF R5A > Conversation ID: 28232929
14:45:55 DIA 003 700 SAPJSF R64 > CPI-C function: CMSEND(SAP)
14:45:55 RD                            S23 Connection to CPI-C client 080 was closed
14:45:55 RD                            S74 > Partner LU name:
14:45:55 RD                            S0R > Host: r1n0v3
14:45:55 RD                            S0I > Partner TP Name: LCRSAPRF
14:45:55 DIA 000 700 BERNIER_Y R49 Communication error, CPIC return code 020, SAP return code 223
14:45:55 DIA 000 700 BERNIER_Y R5A > Conversation ID: 30118701
14:45:55 DIA 000 700 BERNIER_Y R64 > CPI-C function: CMSEND(SAP)
14:46:27 DIA 000 700 BERNIER_Y R49 Communication error, CPIC return code 002, SAP return code 679
14:46:27 DIA 000 700 BERNIER_Y R64 > CPI-C function: CMINIT(SAP)
14:46:27 DIA 000 700 BERNIER_Y R49 Communication error, CPIC return code 002, SAP return code 679
14:46:27 DIA 000 700 BERNIER_Y R64 > CPI-C function: CMINIT(SAP)
14:46:35 DIA 000 700 BERNIER_Y R49 Communication error, CPIC return code 002, SAP return code 679
14:46:35 DIA 000 700 BERNIER_Y R64 > CPI-C function: CMINIT(SAP)
Any idea? How can I fix those CPI-C errors?
Rgds,
Yves

Hi Yves Bernier ,
ABAP stack and JAVA stack makes communicattion Through JRFC using JCO, for this dedicated connections are defined. When communication takes plcae this calls JCo and if that time resource is engaged with another call and it cann not be assigned to the current call then JCO FAILURE ERROR occurs
For this recomended that you shoyuld increase your maximum no of connections (SAP recomonded 300) but you may increase this according to your requirement.this may solve your problem
For CPIC error codes follow this note.
Note 63347 - List: CPIC error codes
https://websmp130.sap-ag.de/sap(bD1lbiZjPTAwMQ==)/bc/bsp/spn/sapnotes/index2.htm?numm=63347&nlang=EN&smpsrv=https%3a%2f%2fwebsmp102%2esap-ag%2ede
regards
Sandeep
IF helpful kindly reward points

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