OWIN – Authentication.SignOut() doesn’t seem to remove the cookie

I had a similar problem for the past few days. Instead of

Request.GetOwinContext().Authentication.authenticationManager.SignOut();

Use ONE(and only one) of these:

Request.GetOwinContext().Authentication.SignOut();

Request.GetOwinContext().Authentication.SignOut(Microsoft.AspNet.Identity.DefaultAuthenticationTypes.ApplicationCookie);

HttpContext.Current.GetOwinContext().Authentication.SignOut(Microsoft.AspNet.Identity.DefaultAuthenticationTypes.ApplicationCookie);

This article explains why your cookies don’t get deleted: https://dzone.com/articles/catching-systemwebowin-cookie

I know my answer isn’t the most research-based, but to tell you the truth, I just couldn’t find WHY my provided code examples work for me. I just know that System.Web messes up Owins cookies if you do SignOut() another way.