I have had SSO against an ASP.NET website working perfectly for years. Now, after only doing the routine upgrade (docker and Discourse) through the admin UI, trying to signing in with SSO yields the following error:
There is a problem with your account. Please contact the site’s administrator.
When I click the “Log In” button in Discourse, I am correctly taken to my ASP.NET app’s sign in page. When I correctly sign in there, I am briefly returned to the /latest page in Discourse, but then quickly redirected to the error page. At that point, the URL in the browser address field changes to the following:
http://[my discourse domain]/session/sso_login?sso=[yadayada]&sig=[yadayada]
I have no idea where to even begin figuring this out as I have no idea what changed to make it happen.
In which logs (and where) should I look?
I appreciate any help!