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2783905 - Error in SUM phase RUN_RSCPFROM_CRR: "RFC_COMMUNICATION_FAILURE"

Symptom

Error occurred during SUM upgrade Execution phase- MAIN_NEWSBAS/RUN_RSCPFROM_CRR:

=========== Repeat Phase ===========
Checks after phase MAIN_NEWBAS/RUN_RSCPFROM_CRR were negative!
Last error code set:
RFC login to system <SID> ashost <sid>-q-pas nr XX gwhost <sid>-q-pas gwservice
sapgw32 failed with code 1 key RFC_COMMUNICATION_FAILURE:
LOCATION CPIC (TCP/IP) on local host with Unicode
ERROR partner '<hostname>:<port>' not reached
....
ERRNO 79
ERRNO TEXT Connection refused
COUNTER 6222

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Environment

SAP Customer Relationship Management 7.0

Product

SAP Customer Relationship Management 7.0 on SAP enhancement package 1 for SAP NetWeaver 7.0

Keywords

RFC_COMMUNICATION_FAILURE, ERRNO 79, Connection refused, RUN_RSCPFROM_CRR, partner, not reached , KBA , BC-UPG-DTM-TLA , Downtime Minimization for ABAP , Problem

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