HTTP Error 503 September 2019

Hello all,

after updating to PBI Report Server September 2019 the service is running but the Reports Page will not be loaded.

Service Unavailable

HTTP Error 503. The service is unavailable.

Logfile says:

2019-10-07 11:09:05.5991|INFO|11|Starting Process: C:\Program Files\Microsoft Power BI Report Server\PBIRS\Portal\RSPortal.exe
2019-10-07 11:09:06.2867|WARN|11|Child Process [Portal] Died. Check the log for further information

Any idea how to fix it?

Best regards