活动目录在微软的产品架构中占有举足轻重的地位，活动目录作为微软产品的粘合剂将微软的全系列产品融合在一起，从而能够为企业提供整套的解决方案，因此了解活动目录就有很重要的意义，而了解活动目录使用的端口，对活动目录的排错等也就有一定的意义，现将活动目录使用到的端口列在下表中：

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

DHCP, MADCAP

UDP 137

User and Computer Authentication,

NetLogon, NetBIOS Name Resolution

TCP 139

User and Computer Authentication, Replication

DFSN, NetBIOS Session Service, NetLogon

详细参见Technet网站：http://technet.microsoft.com/en-us/library/dd772723(WS.10).aspx