Active Directory Service And IIS Problem

I have a ASP.Net Project to read active directory usernames.

Its working fine when running thru asp development server.

But while running thru IIS Server. It displays the following error

"An exception of type 'System.DirectoryServices.DirectoryServicesCOMException' occurred in System.DirectoryServices.dll but was not handled in user code
Additional information: Logon failure: unknown user name or bad password."

This is my Code :

Public Function readADSusers()
Dim enTry As DirectoryEntry = New DirectoryEntry("LDAP://spiretek.local")
Dim mySearcher As DirectorySearcher = New DirectorySearcher(enTry)
mySearcher.Filter = ("(objectClass=user)")
Dim resEnt As SearchResult
For Each resEnt In mySearcher.FindAll()
Select Case myKey
Case "samaccountname"
TextBox1.Text += myResultPropColl(myKey)(0)
End Select
Next
End Function

Please Help Me......This is not the right forum for this, but you will have to provide network credentials (either the current the process is running with or custom ones) to access the active directory.

Jens K. Suessmeyer.

http://www.sqlserver2005.de