3793829 - C4C Outbound Messages Fail With Error 'HTTP Code: 500 ( Internal Server Error )'

All outbound SOAP messages in SAP Cloud for Customer (C4C) towards the same external system fail with error 'HTTP Code: 500 ( Internal Server Error )'.

In SAP Cloud Integration (CPI), the corresponding iFlow messages fail with an error similar to this:

org.apache.cxf.binding.soap.SoapFault: Error reading XMLStreamReader: Unexpected character 'j' (code 106) in prolog; expected '<'
at [row,col {unknown-source}]: [1,1], cause: com.ctc.wstx.exc.WstxUnexpectedCharException: Unexpected character 'j' (code 106) in prolog; expected '<'
at [row,col {unknown-source}]: [1,1]

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• SAP Cloud for Customer v1
• SAP Cloud Integration
• SAP Cloud Connector
• SAP ERP
• SAP S/4HANA

SAP Cloud for Customer add-ins 2025 ; SAP Cloud for Customer core applications 2505 ; SAP Cloud for Customer core applications 2508 ; SAP Cloud for Customer integration with SAP ERP all versions ; SAP Cloud for Customer integration with SAP S/4HANA all versions ; SAP S/4HANA Cloud Public Edition all versions

C4C, CPI, ERP, S4, 500 internal server, Unexpected character, PKIX, propagation, SSL, certificate , KBA , LOD-CRM-INT-ERP , Integration of C4C with ERP , Problem