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How to Resolve ASP.NET C# 4.5 "Unloaded Appdomain Error"

Posted on 2013-10-31
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Last Modified: 2014-01-13
I am working with LDAP, We have Authentication Complete, We are inside the Domain on a webserver.

This error occurs after I inserted code that performs a match with an AD role.  The objective was to get the role from AD then mimic its presence in ASP.NET by "placing" the user in a role within the web application.    There is no standard membership or SQL DB... just the remote AD SQL DB.

Unloaded Appdomain Error
using SavvyLDAP;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.DirectoryServices;
using System.DirectoryServices.AccountManagement;
using System.Linq;
using System.Security.Principal;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;


public partial class Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (HttpContext.Current.User.Identity.IsAuthenticated != true)
        {
            Response.Redirect("~/Login.aspx");
        }
        else
        {
            lbluName.Text = HttpContext.Current.User.Identity.Name.ToString();
            string username = HttpContext.Current.User.Identity.Name.ToString();
            string domain = "dpi";
            string domainAndUsername = domain + @"\" + username;
            GetFilteredRoles(domainAndUsername);
        }
    }

    #region Return All AD Groups - Filtered

    private List<GroupPrincipal> GetFilteredRoles(string username)
    {
        //string domain = "dpi";
        //string domainAndUsername = domain + @"\" + username;
        List<GroupPrincipal> ADFresult = new List<GroupPrincipal>();
        PrincipalContext ctx = new PrincipalContext(ContextType.Domain);
        UserPrincipal user = UserPrincipal.FindByIdentity(ctx, username);
        if (user != null)
        {
            PrincipalSearchResult<Principal> ADFgroups = user.GetAuthorizationGroups();
// the codes below are the ones causing the Unloaded AppDomain issue
            Principal DMPDBRole = ADFgroups.FirstOrDefault(x => x.Name.Contains("DMPDB_"));
            Session.Add("Role", DMPDBRole);
            TransferRole();
        }     
        return ADFresult;        
    }
    #endregion 

    protected void TransferRole()
    {
        if (Session["Role"].ToString() == "DMPDB_Admin")
        {
             // the role insertion code throws a separate Network Service Error
            //Roles.AddUserToRole(username, "DMPDB_Admin");
            Response.Redirect("App_Roles/Admin/Default.aspx");
        }
        else if (Session["Role"].ToString() == "DMPDB_Owner")
        {
            //Roles.AddUserToRole(username, "DMPDB_Owner");
            Response.Redirect("App_Roles/Owner/Default.aspx");
        }
        else if (Session["Role"].ToString() == "DMPDB_Editor")
        {
            //Roles.AddUserToRole(username, "DMPDB_Editor");
            Response.Redirect("App_Roles/Editor/Default.aspx");
        }
        else if (Session["Role"].ToString() == "DMPDB_Reader")
        {
            //Roles.AddUserToRole(username, "DMPDB_Reader");
            Response.Redirect("App_Roles/Reader/Default.aspx");
        }
        else
        {
            Response.Redirect("App_Roles/Unauthorised.aspx");
        }
    }
}

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Question by:XGIS
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3 Comments
 
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Accepted Solution

by:
deanvanrooyen earned 2000 total points
ID: 39620028
stab in the dark, but you want to make sure your web config is tight - make sure that the LDAP connections are setup correctly - just google LDAP asp.etn authenitication examples.

principles, identity and contexts generally shape around threads, when the app runs under th app domain, this thread needs to the relevant settings and config to access your ldap source, so I would aim some sort of config issue.

quick google though and there is a bug in 4.0 that might need a hotfix (though you would suspect 4.5 shouldnt need this? urggg...

stackoverflow.com/questions/7168361/determine-if-user-is-in-ad-group-for-net-4-0-application/13594279#13594279
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LVL 7

Author Comment

by:XGIS
ID: 39652180
Hello deanvanrooyen.. thankyou for the feedback.. I will look into this ASAP.
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LVL 7

Author Closing Comment

by:XGIS
ID: 39778521
Thankyou for your time and patience and input ... the problem was partly related to configuration and incorrectly structured code logic.
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