Both DNS TCP and UDP 53 network ports are used by clients and domain controllers for name resolution purposes.Ĭheck the network port status on a domain controller.Global catalog servers help in finding an object in the Active Directory quickly. TCP Port 32 are required for Global Catalog communication from clients to domain controllers.
TCP and UDP Port 464 is used for Kerberos Password Change.UDP Port 389 for LDAP network port is used to handle normal authentication queries from client computers.TCP Port 139 and UDP 138 network ports are used by the SYSVOL replication service to replicate contents of SYSVOL folder.Both UDP and TCP Port 135 are required for communication between domain controllers and clients to domain controllers.UDP Port 88 is used by clients and domain controllers to authenticate with each other. UDP Port 88 is required for authentication purposes.At a minimum, they must listen on these required ports: Similarly, network ports TCP 139 and UDP 138 are required by the SYSVOL replication service that takes place between all domain controllers. For example, when a client computer needs to authenticate, it connects to a server which hosts KDC service and which is listening on the Port 88. An Active Directory domain controller needs to listen on specific ports to service different client requests.
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