Website on Azure App Service loads forever, stays pending on any request

We discovered a quite bizarre behavior yesterday afternoon on one of our azure app services.

The app loads, gets redirected to our Identity Server and then back to the app and suddenly the app keeps loading forever, leaving every request on pending. Some request get an status code of 200, but no response at all.

We have the very same deployment on different servers (like test, stage, etc.) as every other app service is running normally, which is rather interesting.



We can call our own API via Swagger/Postman without any issue, leaving us with an even bigger question mark.

The negotiate request is for our SignalR service, we already tried to remove it temporarily from our frontend, but it didn't had any impact at all.

Has anyone ever experienced such a behavior?

Tech Stack: Angular, .NET App Service, SignalR, Azure MS SQL

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