3432550 - SAP Cloud connector - Unable to connect SAP BAS to on-premise S4HANA via the Cloud connector

The BAS (Business Application Studio) is integrated with S4HANA via the cloud connector. When a request is triggered from BAS, the following error appears in BAS.

Info: Platform: linux
Info: Development environment: Business Application Studio
Info: Business Application Studio Dev space: Full Stack Cloud Application
Info: Cloud CLI tools: 8.7.4
Info: Application Wizard: 1.13.2
Info: SAP Fiori tools - Fiori generator: 1.12.2

Debug Request to URL: failed with message: Request failed with status code 503. Complete error object: { "message": "Request failed with status code 503", "name": "xxxError", "stack": "AxiosError: Request failed with status code 503\n\tat settle (/managed-content/vscode/unzipped/4__sap-ux-rel___sap-ux-application-modeler-extension@1.0.10369/extension/dist/extension-min.js:1647:1184)\n\tat IncomingMessage.handleStreamEnd (/managed-content/vscode/unzipped/4__sap-ux-rel___sap-ux-application-modeler-extension@1.0.10369/extension/dist/extension-min.js:1648:9305)\n\tat IncomingMessage.emit (node:events:526:35)\n\tat endReadableNT (node:internal/streams/readable:1359:12)\n\tat process.processTicksAndRejections (node:internal/process/task_queues:82:21)", "config": { "baseURL": "https://xxxx_xxx.dest/sap/opu/odata/IWFND/CATALOGSERVICE;v=2", "params": { "saml2": "disabled", "$format": "json" }, "httpsAgent": { "_events": {}, "_eventsCount": 2, "defaultPort": 443, "protocol": "https:", "options": { "rejectUnauthorized": true, "noDelay": true, "path": null }, "requests": {}, "sockets": {}, "freeSockets": {}, "keepAliveMsecs": 1000, "keepAlive": false, "maxSockets": null, "maxFreeSockets": 256, "scheduling": "lifo", "maxTotalSockets": null, "totalSocketCount": 0, "maxCachedSessions": 100, "_sessionCache": { "map": {}, "list": [] } }, "headers": { "Accept": "application/json", "cookie": "", "X-Csrf-Token": "Fetch", "User-Agent": "axios/1.6.0", "Accept-Encoding": "gzip, compress, deflate, br" }, "publicUrl": "http://xxx.xxxxxx.xxxx:80", "method": "get", "url": "/" }, "code": "ERR_BAD_RESPONSE", "status": 503 }    Error: Could not query v4 catalog service for xxxx

Platform: Linux
Development environment: Business Application Studio
Dev Space Type: Full Stack Cloud Application
Cloud connector: 2.15.2 - 2.17.1

BAS, SCC, 503 , KBA , BC-MID-SCC , SAP Cloud Connector On-Demand/On-Premise Connectivity , Problem