Active Directory and Active Directory Domain Services Port Requirements

The following table lists the port requirements for establishing DC to DC communication in all versions of Windows Sever beginning with Windows Server 2003

Protocol and Port	AD and AD DS Usage	Type of traffic
TCP and UDP 389	Directory, Replication, User and Computer Authentication, Group Policy, Trusts	LDAP
TCP 636	Directory, Replication, User and Computer Authentication, Group Policy, Trusts	LDAP SSL
TCP 3268	Directory, Replication, User and Computer Authentication, Group Policy, Trusts	LDAP GC
TCP 3269	Directory, Replication, User and Computer Authentication, Group Policy, Trusts	LDAP GC SSL
TCP and UDP 88	User and Computer Authentication, Forest Level Trusts	Kerberos
TCP and UDP 53	User and Computer Authentication, Name Resolution, Trusts	DNS
TCP and UDP 445	Replication, User and Computer Authentication, Group Policy, Trusts	SMB,CIFS,SMB2, DFSN, LSARPC, NbtSS, NetLogonR, SamR, SrvSvc
TCP 25	Replication	SMTP
TCP 135	Replication	RPC, EPM
TCP Dynamic	Replication, User and Computer Authentication, Group Policy, Trusts	RPC, DCOM, EPM, DRSUAPI, NetLogonR, SamR, FRS
TCP 5722	File Replication	RPC, DFSR (SYSVOL)
UDP 123	Windows Time, Trusts	Windows Time
TCP and UDP 464	Replication, User and Computer Authentication, Trusts	Kerberos change/set password
UDP Dynamic	Group Policy	DCOM, RPC, EPM
UDP 138	DFS, Group Policy	DFSN, NetLogon, NetBIOS Datagram Service
TCP 9389	AD DS Web Services	SOAP
UDP 67 and UDP 2535	DHCP Note DHCP is not a core AD DS service but it is often present in many AD DS deployments.	DHCP, MADCAP
UDP 137	User and Computer Authentication,	NetLogon, NetBIOS Name Resolution
TCP 139	User and Computer Authentication, Replication	DFSN, NetBIOS Session Service, NetLogon