One or more input parameters are invalid

I have a small app that I created to allow me to reset active directory passwords. I functions perfectly under IIS7, but when I deploy the app to IIS6 I'm having issues.

When I try to reset a password, I get an error "One or more input parameters are invalid"

I have hard coded the username and password in hopes this would help solve the problem, but I'm still getting the error. Any help would be greatly appreciated.

This is the example that I have been following to create the app

Active Directory Account Management

Cheers,
Brendan

ADMethodsAccountManagement ADMethods = new ADMethodsAccountManagement();

        public string SetSecurePassword()
        {
            RandomPassword rp = new RandomPassword();
            return RandomPassword.Generate(8, 10);
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
         //string sPwd = SetSecurePassword();
            string sPwd = "Password123!";
         UserPrincipal myUser = ADMethods.GetUser("Test1");
         myUser.GivenName = "Given Name";
         myUser.Surname = "Surname";
         myUser.MiddleName = "Middle Name";
         myUser.EmailAddress = "test1@test.com";
         myUser.EmployeeId = "Employee ID";
         myUser.SetPassword(sPwd);
         myUser.Save();
         lblStatus.Text = "Success";
         lblPassword.Text = sPwd.ToString();
        }

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[COMException (0x80005008): One or more input parameters are invalid
]

[PrincipalOperationException: One or more input parameters are invalid
]
   System.DirectoryServices.AccountManagement.SDSUtils.SetPassword(DirectoryEntry de, String newPassword) +284
   System.DirectoryServices.AccountManagement.ADStoreCtx.SetPassword(AuthenticablePrincipal p, String newPassword) +76
   System.DirectoryServices.AccountManagement.PasswordInfo.SetPassword(String newPassword) +56
   System.DirectoryServices.AccountManagement.AuthenticablePrincipal.SetPassword(String newPassword) +21
   Email_User.WebForm2.Button1_Click(Object sender, EventArgs e) in C:\Documents and Settings\Administrator\My Documents\Visual Studio 2008\Projects\testpasswordreset\testpasswordreset\WebForm2.aspx.cs:35
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +111
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +110
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565

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