The service is available and accessible via direct access to the backend system, however the HTTP error 503 Service not available appears when accessing via Web Dispatcher.
When reproducing the issue with Web Dispatcher (dev_webdisp) trace level set to 2 or 3, folllowing entries are found:
[Thr 0] IcrFindTargetSystem: No system found for <url / vhost / path>
[Thr 0] HttpGetRouteTargetSystem: no system available, rc=-2
[Thr 0] No target system found
SAP Web Dispatcher release independent;
wdisp/system, icm/HTTP/mod, SRCSRV, SRCVHOST, SRCURL , KBA , icmenosystemfound , BC-CST-WDP , Web Dispatcher , Problem
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