MVC3 destroying session on redirecttoaction

Question

I have an issue with sessions in an MVC3 application. In one controller I am receiving a post request then adding the value to session before redirecting to the controllers get

Answer 1

Solution:

Some nutter named the session state cookie name in the web.config and the authentication forms name the same thing.

Obviously the effect it was having was trying to store session and cookies in something called the same thing. Im very surprised this just did not blow up.

Thanks for your help @dknaack, I wouldnt have spotted this so quickly if you were not pointing me in the correct direction.