3664866 - "HTTP 403 Forbidden" error when connecting to SAP on-premise system via Cloud Integration

Symptom

While attempting to use Cloud Integration connectivity to SAP on-premise system via Cloud Connector, the following error occurs:

org.apache.cxf.transport.http.HTTPException: HTTP response '403: Forbidden. <!DOCTYPE html PUBLIC"-//W3C//DTD HTML 4.01Transitional//EN"><html><head><title>Logon Error Message</title><META http-equiv="Content-Type" content="text/html;charset=UTF-8"><style type="text/css">body...
From the Trace level 2 or 3 'dev_icm' file in backend system can be found below:

HttpParseResponseHeader: Version: 1001
[Thr 140379258005248] HttpParseResponseHeader: Keep-Alive: 1
[Thr 140379258005248] HTTP response (raw) [23/415282/1]:
[Thr 140379258005248] HTTP/1.1 403 Forbidden
[Thr 140379258005248] content-type: text/html; charset=utf-8
[Thr 140379258005248] content-length: 1819
[Thr 140379258005248] sap-perf-fesrec: 1199.000000
[Thr 140379258005248] Connection Info: role=Server, local=<host:port>, peer=<IP>, protocol=HTTPS

Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.

Environment

SAP Integration Suite
SAP Business Technology Platform
Cloud Integration

Product

Cloud Integration all versions ; SAP Integration Suite all versions

Keywords

Cloud Integration, SAP Integration Suite, SAP Cloud Platform Integration, Cloud Platform Integration, SAP CPI, CPI, SCPI, HANA Cloud Integration, HCI, SAP HCI, tenant, iFlow, Integration Flow, 403 Forbidden, SICF service, SOAP Adapter , KBA , LOD-HCI-PI-CON-SOAP , SOAP Adapter , Problem

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