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POASP.NET Authentification fails with IE 10
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  1. POASP.NET Authentification fails with IE 10
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    copied!<p>today I've encountered with strange issue. My site was running on application pool under .NET 4 and today we noticed that it can't authenticate users under IE 10 (with other browsers everything is ok). Here's the exception that was thrown: </p> <blockquote> <p>Server Error in '/' Application.</p> <p>Unable to cast object of type 'System.Security.Principal.GenericIdentity' to type 'System.Web.Security.FormsIdentity'. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. </p> <p>Exception Details: System.InvalidCastException: Unable to cast object of type 'System.Security.Principal.GenericIdentity' to type 'System.Web.Security.FormsIdentity'.</p> </blockquote> <p>But after upgrading .NET 4 to version 4.5 error has gone away. The strange thing is that we didn't change the version of .NET on application pool, it is still .NET 4.</p> <p>By the way I'm using custom principal and I'm attaching userData to AuthenticationTicket. Here's my code from the Global.asax:</p> <pre><code>protected void Application_PostAuthenticateRequest(object sender, EventArgs e) { HttpCookie authCooke = Request.Cookies[FormsAuthentication.FormsCookieName]; if (authCooke != null) { FormsAuthenticationTicket authTicket = FormsAuthentication.Decrypt(authCooke.Value); if (authTicket != null) { var identity = new GenericIdentity(authTicket.Name, "Forms"); var principal = new CustomPrincipal(identity); string userData = ((FormsIdentity)(Context.User.Identity)).Ticket.UserData; var serializer = new JavaScriptSerializer(); principal.User = (User)serializer.Deserialize(userData, typeof(User)); Context.User = principal; Thread.CurrentPrincipal = principal; } } } </code></pre> <p>Could anybody explain to me what I am doing wrong and how updating version of .NET without changing it on application pool could affect the site?</p>
 

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