Cannot connect to Sitefinity instance after upgrading to 14.4.8135

[ssi-acvcsc]

After upgrading to Sitefinity 14.4.8135, we can no longer connect to our deployed Sitefinity instance.

Looks like the authentication "/Sitefinity/oauth/authorize" fails and redirects to a wrong "null" url, leading to a "Couldn't find it!" screen result:

As there is no available package exactly matching our Sitefinity, we took the closest one : "@progress/sitefinity-adminapp-sdk": "14.4.8133"

Despite having errors in the browser console on both scenarios, it still works if I connect to a local instance (same SF version, configuration,...)

screen-capture.1.webm

[stefankoserkov]

Hello @ssi-acvcsc,

I apologize for the late response.

This issue is most likely caused by either custom errors in IIS or unproperly configured Sitefinity service for adminapp extensions development, for the latter please see this section of our readme. As of IIS settings, on your development server, the Error pages (under IIS Section of the site) and the .NET Error Pages (under ASP.NET Section of the site) should not contain entries for the 400 error.

Hope this helps.

Stefan