.NET 2.0 Web App Authentication Failing: “The ticket supplied was invalid”

Question

I have a .NET 4.0 application with a 2.0 application as a child. The web applications are not in a multi-server environment; only one server is involved in serving these reques

Answer 1

In case someone comes across this same issue, I was able to fix this error by adding some entries to the section of my .NET 2.0 application's Web.config. The added entries were:

Edit (2012-05-04): After installing Security Bulletin MS11-100 on the server, the authentication once again broke on the 2.0 application. Adding the following to the Web.config of the 4.0 application fixed the issue: