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Ports Are Required to Communicated by AD CS and Client System?

Surendra Nishad
25/02/2017 0 0

What All Ports Are Required to Communicated by Active Directory Domain Controller and Client System?

As the major port requirement for Client computers and Active Directory Domain Controllers communicating with each other.

Active Directory communication takes place using several ports. These ports are required by both client computers and Domain Controllers. As an example, when a client computer tries to find a domain controller it always sends a DNS Query over Port 53 to find the name of the domain controller in the domain.

The following is the list of services and their ports used for Active Directory communication:

  • UDP Port 88 for Kerberos authentication
  • UDP and TCP Port 135 for domain controllers-to-domain controller and client to domain controller operations.
  • TCP Port 139 and UDP 138 for File Replication Service between domain controllers.
  • UDP Port 389 for LDAP to handle normal queries from client computers to the domain controllers.
  • TCP and UDP Port 445 for File Replication Service
  • TCP and UDP Port 464 for Kerberos Password Change
  • TCP Port 3268 and 3269 for Global Catalog from client to domain controller.
  • TCP and UDP Port 53 for DNS from client to domain controller and domain controller to domain controller.

As mentioned the ports in Firewall between client computers and domain controllers, or between domain controllers, will enable Active Directory to function properly. 

Note: If the some of application has been intregrated with Client computer & AD DC, than need to open application communication ports as well for proper functioning the application.

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