.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

With the intention of aport info to the previous post, it works for me adding this keys into the APP (both 4.0) web.config: