2224052 - 503 Service not available - IcrFindTargetSystem: No system found for

The service is available and accessible via direct access to the back-end system, however the HTTP error 503 Service not available appears when accessing via SAP Web Dispatcher.

When reproducing the issue via the SAP Web Dispatcher (dev_webdisp) trace level set to 2 or 3, following entries are found:

[Thr ...] IcrFindTargetSystem: No system found for  <url / vhost / path>

[Thr ...] HttpGetRouteTargetSystem: no system available, rc=-2

[Thr ...] No target system found

or

[Thr ...] Request could not be dispatched to system [SID]: no valid server found. Check connectivity to backend servers.

or

[Thr ...] PlugInStopConn: role: Server(1), error: No system found(-51), write_err: 1
[Thr ...] PlugInStopConn: write error response
[Thr ...] HTTP [<connection id>] error:  ICMENOSYSTEMFOUND (No system found); No target system found

or

[Thr ...] *** ERROR => HttpGetCgpVirtHost: error No data available(-15) during virtual host lookup [icxxvhostuti 257]

• SAP Web Dispatcher
• Operating System independent
• Database independent
• SAP NetWeaver based system
• ABAP Platform based system

wdisp/system, icm/HTTP/mod, SRCSRV, SRCVHOST, SRCURL, 503 Service not available, Not Reachable,sap/bc/,/ui2/nwbc/ , KBA , BC-CST-WDP , Web Dispatcher , BC-MID-SCC , SAP Cloud Connector On-Demand/On-Premise Connectivity , BC-JAS-COR , Enterprise Runtime, Core J2EE Framework , BC-CST , Client/Server Technology , Problem