There are two methods to speed up access. The method
you use depends on the port number you can use: port 389 or port
3268.
Active Directory uses port 3268 for the Global Catalog. LDAP
queries directed to the global catalog are faster because they do
not involve referrals to different domain controllers.
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Note
Trend Micro recommends using port 3268 for LDAP queries
to Active Directory.
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Active Directory uses port 389 for LDAP query. If one item cannot
be queried in one domain controller, it uses the LDAP referral mechanism
to query another domain controller. Use port 389 if your company
has only one domain or if port 3268 is unavailable.
