No OWIN authentication manager is associated with the request

Question

After trying to enable owin & AspNet Identity to my Web Api project (in VS 2013 + .Net 4.5.1) I get the following error in each valid or unvalid(request to none exist co

Answer 1

Changing the owin:AutomaticAppStartup key to true in Web.config fixed this for me, i.e. change it from:

to this: