Question

I am trying to access to two websites simultaneously, both built using MVC. If Im logged In in one, I cant access the other. How can I correct the following?

I am having the error message:

Unable to validate data.
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.

Exception Details: System.Web.HttpException: Unable to validate data.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean
fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length,
Boolean useValidationSymAlgo, Boolean useLegacyMode, IVType ivType,
Boolean signData) +4956871
System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean
fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length,
Boolean useValidationSymAlgo, Boolean useLegacyMode, IVType ivType)
+155 System.Web.Security.FormsAuthentication.Decrypt(String encryptedTicket) +283
MvcUI.MvcApplication.FormsAuthentication_OnAuthenticate(Object sender,
FormsAuthenticationEventArgs args) in
C:\Hg\MyProject\Code\MvcUI\Global.asax.cs:40
System.Web.Security.FormsAuthenticationModule.OnAuthenticate(FormsAuthenticationEventArgs
e) [phone]
System.Web.Security.FormsAuthenticationModule.OnEnter(Object source,
EventArgs eventArgs) +88
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
+80 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +270

---

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.237

---

New error message after inserting the same machine key for both apps

Value cannot be null.
Parameter name: value
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.

Exception Details: System.ArgumentNullException: Value cannot be null.
Parameter name: value

Source Error:

Line 71: { Line 72: user =
myProject.API.User.Load(userName); Line 73:
HttpContext.Current.Cache.Add(key, user, null, System.Web.Caching.Cache.NoAbsoluteExpiration, Line 74: new
TimeSpan(0, 2, 0), System.Web.Caching.CacheItemPriority.Default,
null); Line 75: }

[ArgumentNullException: Value cannot be null.
Parameter name: value]
System.Web.Caching.CacheEntry..ctor(String key, Object value, CacheDependency dependency, CacheItemRemovedCallback onRemovedHandler, DateTime utcAbsoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority priority, Boolean isPublic) +8942559
System.Web.Caching.CacheInternal.DoInsert(Boolean isPublic, String key, Object value, CacheDependency dependencies, DateTime utcAbsoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority priority, CacheItemRemovedCallback onRemoveCallback, Boolean replace) +93
System.Web.Caching.Cache.Add(String key, Object value, CacheDependency dependencies, DateTime absoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority priority, CacheItemRemovedCallback onRemoveCallback) +81
MvcUI.MvcApplication.GetUserFromCache(String userName) in C:\Dev\myProject\Code\MvcUI\Global.asax.cs:73
MvcUI.MvcApplication.FormsAuthentication_OnAuthenticate(Object sender, FormsAuthenticationEventArgs args) in C:\Dev\myProject\Code\MvcUI\Global.asax.cs:40
System.Web.Security.FormsAuthenticationModule.OnAuthenticate(FormsAuthenticationEventArgs e) +9043237
System.Web.Security.FormsAuthenticationModule.OnEnter(Object source, EventArgs eventArgs) +84
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +148
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

---

Global.asax.cs

public class MvcApplication : System.Web.HttpApplication
{
public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
filters.Add(new HandleErrorAttribute());
}

    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
        routes.IgnoreRoute("WebService/{*pathInfo}");

        routes.MapRoute(
                "Default", // Route name
                "{controller}/{action}/{id}", // URL with parameters
                new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
        );
    }

    public void FormsAuthentication_OnAuthenticate(object sender, FormsAuthenticationEventArgs args)
    {
        if (FormsAuthentication.CookiesSupported)
        {
            if (null != Request.Cookies[FormsAuthentication.FormsCookieName])
            {
                FormsAuthenticationTicket ticket = FormsAuthentication.Decrypt(Request.Cookies[FormsAuthentication.FormsCookieName].Value);
                args.User = new myProject.Web.UI.Classes.UserPrincipal(GetUserFromCache(ticket.Name));
            }
        }
        else
            throw new HttpException("Cookieless Forms Authentication is not supported for this application.");
    }

    public void WindowsAuthentication_OnAuthenticate(object sender, WindowsAuthenticationEventArgs args)
    {
        string username = args.Identity.Name.Substring(args.Identity.Name.IndexOf("\\") + 1);
        myProject.API.User user = GetUserFromCache(username);

        if (null == user)
            throw new HttpException("User could not be found.");

        args.User = new myProject.Web.UI.Classes.UserPrincipal(user);
    }

    protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();

        RegisterGlobalFilters(GlobalFilters.Filters);
        RegisterRoutes(RouteTable.Routes);
    }

    private static myProject.API.User GetUserFromCache(string userName)
    {
        string key = "User " + userName;
        myProject.API.User user = (myProject.API.User)HttpContext.Current.Cache[key];
        if (null == user)
        {
            user = myProject.API.User.Load(userName);
            HttpContext.Current.Cache.Add(key, user, null, System.Web.Caching.Cache.NoAbsoluteExpiration,
                    new TimeSpan(0, 2, 0), System.Web.Caching.CacheItemPriority.Default, null);
        }

        return user;
    }
}

Answer 1

Thanks to all of you for having tried to reply to the question. Indeed they were all helpful. I solved the problem myself by adding a machinekey to the wenconfig, as well as a form name had to be there. without te form name, even the machine key was not useful