JCO_COMMUNICATION_FAILURE - CPI-C errors

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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