MVC website redirecting to logout page immediately after logging in

Over the past couple days I have been converting the authentication and authorization method on an existing MVC website to use Auth0, an OpenID provider. During the process of converting the website’s login and logout routines I ran into an issue where no matter what the website would redirect to the logout page immediately after hitting the login route. After much trial and error I finally pinpointed the problem.

In my project’s web.config I had the following code:

<authentication mode="Forms">
	<forms loginUrl="~/Auth/Logout" timeout="2880" />
</authentication>

I changed this to mode="None" and the login page now works flawlessly.

<authentication mode="None"></authentication>