Unable to retrieve AD login ASP.net

Hi,

I've got the following code. When running the code in development on my local PC the username shows correctly. When I upload it to the IIS server it shows "Unkown Error", "Configuration Error". This is a piece of code from a previous collegue who has left the company now i'm afraid. I'm running on IIS 7.5.

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Collections.Generic;
using System.DirectoryServices;
using System.Web.Configuration;
using System.Xml;
using System.Text;
using System.Globalization;

namespace PromptedInspConfig
{
    public partial class Site : System.Web.UI.MasterPage
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Page.Header.DataBind();
            Menu1.DataSource = Server.MapPath("./SiteMenu.xml");
            Menu1.DataBind();
        }

        private User user;
        public User LocalUser { get { return user; } set { user = value; } }
        public Dictionary<string, User> users = new Dictionary<string, User>();

        public List<Menu> menus = new List<Menu>();

        public User FindUser(string username)
        {
            if (string.IsNullOrEmpty(username)) return null;
            if (users.ContainsKey(username)) return users[username];

            try
            {
                string ldap = WebConfigurationManager.AppSettings["LDAP"];
                DirectorySearcher searcher = new DirectorySearcher(new DirectoryEntry(ldap), string.Format("(&(objectClass=user)(sAMAccountName={0}))", username));
                searcher.PropertiesToLoad.Add("sAMAccountName");
                searcher.PropertiesToLoad.Add("givenName");
                searcher.PropertiesToLoad.Add("sn");
                searcher.PropertiesToLoad.Add("userPrincipalName");
                searcher.PropertiesToLoad.Add("mail");
                searcher.PropertiesToLoad.Add("telephoneNumber");
                searcher.PropertiesToLoad.Add("distinguishedName");
                searcher.PropertiesToLoad.Add("memberOf");

                SearchResult result = searcher.FindOne();
                if (result != null)
                {
                    User user = new User();
                    user.Username = username;
                    if (result.Properties.Contains("givenName")) user.Forename = result.Properties["givenName"][0] as string;
                    if (result.Properties.Contains("sn")) user.Surname = result.Properties["sn"][0] as string;
                    if (result.Properties.Contains("userPrincipalName")) user.Principal = result.Properties["userPrincipalName"][0] as string;
                    if (result.Properties.Contains("mail")) user.Email = result.Properties["mail"][0] as string;
                    if (result.Properties.Contains("telephoneNumber")) user.Telephone = result.Properties["telephoneNumber"][0] as string;
                    if (result.Properties.Contains("distinguishedName")) user.DistinguishedName = result.Properties["distinguishedName"][0] as string;
                    if (result.Properties.Contains("memberOf"))
                    {
                        foreach (object o in result.Properties["memberOf"])
                        {
                            user.MemberOf.Add((string)o);
                        }
                    }

                    users.Add(username, user);
                    return user;
                }
                return null;
            }
            catch (Exception ex) { return null; }
        }

        public List<User> ListUsers(string ou)
        {
            if (string.IsNullOrEmpty(ou)) return new List<User>();

            try
            {
                string ldap = WebConfigurationManager.AppSettings["LDAP"];
                DirectorySearcher searcher = new DirectorySearcher(new DirectoryEntry(ldap), string.Format("(&(objectClass=user)(ou:dn:={0}))", ou));
                searcher.PropertiesToLoad.Add("sAMAccountName");
                searcher.PropertiesToLoad.Add("givenName");
                searcher.PropertiesToLoad.Add("sn");
                searcher.PropertiesToLoad.Add("userPrincipalName");
                searcher.PropertiesToLoad.Add("mail");
                searcher.PropertiesToLoad.Add("telephoneNumber");

                SearchResultCollection results = searcher.FindAll();
                List<User> list = new List<User>();
                if (results.Count > 0)
                {
                    foreach (SearchResult result in results)
                    {
                        User user = new User();
                        if (result.Properties.Contains("sAMAccountName")) user.Username = result.Properties["sAMAccountName"][0] as string;
                        if (result.Properties.Contains("givenName")) user.Forename = result.Properties["givenName"][0] as string;
                        if (result.Properties.Contains("sn")) user.Surname = result.Properties["sn"][0] as string;
                        if (result.Properties.Contains("userPrincipalName")) user.Principal = result.Properties["userPrincipalName"][0] as string;
                        if (result.Properties.Contains("mail")) user.Email = result.Properties["mail"][0] as string;
                        if (result.Properties.Contains("telephoneNumber")) user.Telephone = result.Properties["telephoneNumber"][0] as string;

                        list.Add(user);
                    }
                }
                return list;
            }
            catch (Exception ex) { return new List<User>(); }
        }

        public User FindUser()
        {
            if (Context.Items.Contains("x-localuser-obj")) return (User)Context.Items["x-localuser-obj"];

            string username = Request.LogonUserIdentity.Name;
            if (string.IsNullOrEmpty(username)) return null;

            if (username.IndexOf('\\') > -1) username = username.Substring(username.IndexOf('\\') + 1);
            User local = FindUser(username);
            if (local != null) Context.Items.Add("x-localuser-obj", local);
            return local;
        }

        public string GetDateInformation()
        {
            DateTime now = DateTime.Now;

            StringBuilder builder = new StringBuilder();
            builder.Append(CultureInfo.CurrentCulture.Calendar.GetDayOfWeek(now).ToString());

            string suf = "th";
            switch (now.Day)
            {
                case 1: { suf = "st"; break; }
                case 2: { suf = "nd"; break; }
                case 3: { suf = "rd"; break; }
                case 21: { suf = "st"; break; }
                case 22: { suf = "nd"; break; }
                case 23: { suf = "rd"; break; }
                case 31: { suf = "st"; break; }
            }

            builder.AppendFormat(" {0}{1}", now.Day, suf);
            builder.AppendFormat(" {0} {1}", now.ToString("MMMM"), now.Year);

            return builder.ToString();
        }

        public string GetWeekInformation()
        {
            return string.Format("Week {0}", CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(DateTime.Now, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday));
        }

        
        protected override void OnInit(EventArgs e)
        {
            LocalUser = FindUser();
            if (LocalUser == null)
            {
                LocalUser = new User();
                LocalUser.Forename = "Unknown";
                LocalUser.Surname = "User";
                LocalUser.Username = "Configuration Error";
            }

            //GetMenu();

            base.OnInit(e);
        }
    }
}

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Many Thanks
Lee