DirectoryEntry oDE = new DirectoryEntry(\"LDAP://DC=Test1,DC=Test2,DC=gov,DC=lk\"); using (DirectorySearcher ds = new DirectorySearcher(oDE)) { ds.PropertiesToL
I know this might sound silly, but I recently came across this myself, Make sure the domain controller is not read-only.
You may also need to enable ReferralChasing on the DirectorySearcher - http://msdn.microsoft.com/en-us/library/ms180884(VS.80).aspx.