Try to get rid of the authentication token:
FormsAuthentication.SignOut();
Context.Response.Cookies.Item(FormsAuthentication.FormsCookieName).Expires = Date.Now;
return RedirectToAction("LogOut");
Also, make sure the page is not cached:
Response.Cache.SetExpires(DateTime.UtcNow.AddMinutes(-1));
Response.Cache.SetCacheability(HttpCacheability.NoCache); Response.Cache.SetNoStore();
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