System.IO Exception: Logon failure: unknown user name or bad password
<identity impersonate="true" userName="XXX" password="XXXXX"/>

string UserConfigXML ="\\servername\Engineering\Kiosk Back Up\UserCFG.XML";
reader = new StreamReader(UserConfigXML);

string input = null;
string[] sArray;
while ((input = reader.ReadLine().Trim()) != "</USERS>")
{
    if (input.Contains("<USER NAME="))
    {
        sArray = input.Split(new Char[] { '"' });
        string sUserName = sArray[1].ToString().ToUpper();
        string sDelivery = "";
        while ((input = reader.ReadLine().Trim()) != ("</USER>"))
        {
            char[] array2 = new char[] { '<', '>' };
            if (input.Contains("<DELIVERY_MECHANISM>"))
            {
                string[] mechanism = input.Split(array2);
                sDelivery = mechanism[2].ToString().ToUpper();
                if (sDelivery == "WEBMAIL")
                {
                    UsersList.Add(sUserName);
                }
            }
        }
    }
}
return UsersList;