OData Services not reachable (Server alias error)

I have a problem with a UI5 application I wrote. On the DEV-System everything works fine, but after transporting to the Q-System the apllication dosen't work anymore.

At first I had to activate the OData service itself.

Now I can start the UI5 application and the site is loaded correctly (the controls and the ui) but the backend calls via OData are failing. I have 2 problems right now:

- The application can't access the Java Script of the site properly

If I copy/paste the URL into Chrome I get a response with the JS.

- The calls to the OData-Services are failing

Direct call of the service in Chrome:

Output of TA /IWFND/ERROR_LOG

System alias is not used in the DEV-System, and I checked if the Service is active in SICF and SPRO.

Any ideas?