Ports used in Active Directory Replication


A customer the other day was looking to configure his Domain Controller in a remote Branch Office behind a firewall. The question was what ports are required for Active Directory Replication.


The answer is the following;


Port Assignments for Active Directory Replication


Service Name UDP TCP


LDAP              389  389


LDAP                     636


LDAP                     3268


Kerboros         88    88


DNS                53    53


smb over IP     445   445


I thoroughly recommend if you are looking to deploy Windows 2003 in an Branch Office (Hub and Spoke) scenario then download the Branch Office Deployment Guide. This is an excellent reference covering all aspects of Active Directory Deployment. Chapter 3 is particulary good on the Physical configuration of your Active Directory Environment

Comments (11)

  1. Anonymous says:

    ldap start queries from port no 3268 & after that it goes to 368

  2. Active Directory Health Check says:

    Active Directory Health Check

    pdtechguru.wordpress.com/…/active-directory-health-check

  3. Diwakar says:

    3268 is GC port

  4. Diwakar says:

    636 is LDAP on SSL

  5. Tanmaya says:

    Can any one advise me, what is the Port used only for AD replication .. Is that any specific port ?

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