Ports and protocols
The following table summarizes the information from the "System services ports" section. This table is sorted by port number instead of by the service name.| Port | Protocol | Application protocol | System service name |
| n/a | GRE | GRE (IP protocol 47) | Routing and Remote Access |
| n/a | ESP | IPsec ESP (IP protocol 50) | Routing and Remote Access |
| n/a | AH | IPsec AH (IP protocol 51) | Routing and Remote Access |
| 7 | TCP | Echo | Simple TCP/IP Services |
| 7 | UDP | Echo | Simple TCP/IP Services |
| 9 | TCP | Discard | Simple TCP/IP Services |
| 9 | UDP | Discard | Simple TCP/IP Services |
| 13 | TCP | Daytime | Simple TCP/IP Services |
| 13 | UDP | Daytime | Simple TCP/IP Services |
| 17 | TCP | Quotd | Simple TCP/IP Services |
| 17 | UDP | Quotd | Simple TCP/IP Services |
| 19 | TCP | Chargen | Simple TCP/IP Services |
| 19 | UDP | Chargen | Simple TCP/IP Services |
| 20 | TCP | FTP default data | FTP Publishing Service |
| 21 | TCP | FTP control | FTP Publishing Service |
| 21 | TCP | FTP control | Application Layer Gateway Service |
| 23 | TCP | Telnet | Telnet |
| 25 | TCP | SMTP | Simple Mail Transfer Protocol |
| 25 | TCP | SMTP | Exchange Server |
| 42 | TCP | WINS Replication | Windows Internet Name Service |
| 42 | UDP | WINS Replication | Windows Internet Name Service |
| 53 | TCP | DNS | DNS Server |
| 53 | UDP | DNS | DNS Server |
| 53 | TCP | DNS | Internet Connection Firewall/Internet Connection Sharing |
| 53 | UDP | DNS | Internet Connection Firewall/Internet Connection Sharing |
| 67 | UDP | DHCP Server | DHCP Server |
| 67 | UDP | DHCP Server | Internet Connection Firewall/Internet Connection Sharing |
| 69 | UDP | TFTP | Trivial FTP Daemon Service |
| 80 | TCP | HTTP | Windows Media Services |
| 80 | TCP | HTTP | World Wide Web Publishing Service |
| 80 | TCP | HTTP | SharePoint Portal Server |
| 88 | TCP | Kerberos | Kerberos Key Distribution Center |
| 88 | UDP | Kerberos | Kerberos Key Distribution Center |
| 102 | TCP | X.400 | Microsoft Exchange MTA Stacks |
| 110 | TCP | POP3 | Microsoft POP3 Service |
| 110 | TCP | POP3 | Exchange Server |
| 119 | TCP | NNTP | Network News Transfer Protocol |
| 123 | UDP | NTP | Windows Time |
| 123 | UDP | SNTP | Windows Time |
| 135 | TCP | RPC | Message Queuing |
| 135 | TCP | RPC | Remote Procedure Call |
| 135 | TCP | RPC | Exchange Server |
| 135 | TCP | RPC | Certificate Services |
| 135 | TCP | RPC | Cluster Service |
| 135 | TCP | RPC | Distributed File System |
| 135 | TCP | RPC | Distributed Link Tracking |
| 135 | TCP | RPC | Distributed Transaction Coordinator |
| 135 | TCP | RPC | Distributed File Replication Service |
| 135 | TCP | RPC | Fax Service |
| 135 | TCP | RPC | Microsoft Exchange Server |
| 135 | TCP | RPC | File Replication Service |
| 135 | TCP | RPC | Group Policy |
| 135 | TCP | RPC | Local Security Authority |
| 135 | TCP | RPC | Remote Storage Notification |
| 135 | TCP | RPC | Remote Storage Server |
| 135 | TCP | RPC | Systems Management Server 2.0 |
| 135 | TCP | RPC | Terminal Services Licensing |
| 135 | TCP | RPC | Terminal Services Session Directory |
| 137 | UDP | NetBIOS Name Resolution | Computer Browser |
| 137 | UDP | NetBIOS Name Resolution | Server |
| 137 | UDP | NetBIOS Name Resolution | Windows Internet Name Service |
| 137 | UDP | NetBIOS Name Resolution | Net Logon |
| 137 | UDP | NetBIOS Name Resolution | Systems Management Server 2.0 |
| 138 | UDP | NetBIOS Datagram Service | Computer Browser |
| 138 | UDP | NetBIOS Datagram Service | Messenger |
| 138 | UDP | NetBIOS Datagram Service | Server |
| 138 | UDP | NetBIOS Datagram Service | Net Logon |
| 138 | UDP | NetBIOS Datagram Service | Distributed File System |
| 138 | UDP | NetBIOS Datagram Service | Systems Management Server 2.0 |
| 138 | UDP | NetBIOS Datagram Service | License Logging Service |
| 139 | TCP | NetBIOS Session Service | Computer Browser |
| 139 | TCP | NetBIOS Session Service | Fax Service |
| 139 | TCP | NetBIOS Session Service | Performance Logs and Alerts |
| 139 | TCP | NetBIOS Session Service | Print Spooler |
| 139 | TCP | NetBIOS Session Service | Server |
| 139 | TCP | NetBIOS Session Service | Net Logon |
| 139 | TCP | NetBIOS Session Service | Remote Procedure Call Locator |
| 139 | TCP | NetBIOS Session Service | Distributed File System |
| 139 | TCP | NetBIOS Session Service | Systems Management Server 2.0 |
| 139 | TCP | NetBIOS Session Service | License Logging Service |
| 143 | TCP | IMAP | Exchange Server |
| 161 | UDP | SNMP | SNMP Service |
| 162 | UDP | SNMP Traps Outbound | SNMP Trap Service |
| 389 | TCP | LDAP Server | Local Security Authority |
| 389 | UDP | LDAP Server | Local Security Authority |
| 389 | TCP | LDAP Server | Distributed File System |
| 389 | UDP | LDAP Server | Distributed File System |
| 443 | TCP | HTTPS | HTTP SSL |
| 443 | TCP | HTTPS | World Wide Web Publishing Service |
| 443 | TCP | HTTPS | SharePoint Portal Server |
| 443 | TCP | RPC over HTTPS | Exchange Server 2003 |
| 445 | TCP | SMB | Fax Service |
| 445 | TCP | SMB | Print Spooler |
| 445 | TCP | SMB | Server |
| 445 | TCP | SMB | Remote Procedure Call Locator |
| 445 | TCP | SMB | Distributed File System |
| 445 | TCP | SMB | License Logging Service |
| 445 | TCP | SMB | Net Logon |
| 464 | TCP | Kerberos Password V5 | Net Logon |
| 500 | UDP | IPsec ISAKMP | Local Security Authority |
| 515 | TCP | LPD | TCP/IP Print Server |
| 548 | TCP | File Server for Macintosh | File Server for Macintosh |
| 554 | TCP | RTSP | Windows Media Services |
| 563 | TCP | NNTP over SSL | Network News Transfer Protocol |
| 593 | TCP | RPC over HTTPS endpoint mapper | Remote Procedure Call |
| 593 | TCP | RPC over HTTPS | Exchange Server |
| 636 | TCP | LDAP SSL | Local Security Authority |
| 636 | UDP | LDAP SSL | Local Security Authority |
| 993 | TCP | IMAP over SSL | Exchange Server |
| 995 | TCP | POP3 over SSL | Exchange Server |
| 1067 | TCP | Installation Bootstrap Service | Installation Bootstrap protocol server |
| 1068 | TCP | Installation Bootstrap Service | Installation Bootstrap protocol client |
| 1270 | TCP | MOM-Encrypted | Microsoft Operations Manager 2000 |
| 1433 | TCP | SQL over TCP | Microsoft SQL Server |
| 1433 | TCP | SQL over TCP | MSSQL$UDDI |
| 1434 | UDP | SQL Probe | Microsoft SQL Server |
| 1434 | UDP | SQL Probe | MSSQL$UDDI |
| 1645 | UDP | Legacy RADIUS | Internet Authentication Service |
| 1646 | UDP | Legacy RADIUS | Internet Authentication Service |
| 1701 | UDP | L2TP | Routing and Remote Access |
| 1723 | TCP | PPTP | Routing and Remote Access |
| 1755 | TCP | MMS | Windows Media Services |
| 1755 | UDP | MMS | Windows Media Services |
| 1801 | TCP | MSMQ | Message Queuing |
| 1801 | UDP | MSMQ | Message Queuing |
| 1812 | UDP | RADIUS Authentication | Internet Authentication Service |
| 1813 | UDP | RADIUS Accounting | Internet Authentication Service |
| 1900 | UDP | SSDP | SSDP Discovery Service |
| 2101 | TCP | MSMQ-DCs | Message Queuing |
| 2103 | TCP | MSMQ-RPC | Message Queuing |
| 2105 | TCP | MSMQ-RPC | Message Queuing |
| 2107 | TCP | MSMQ-Mgmt | Message Queuing |
| 2393 | TCP | OLAP Services 7.0 | SQL Server: Downlevel OLAP Client Support |
| 2394 | TCP | OLAP Services 7.0 | SQL Server: Downlevel OLAP Client Support |
| 2460 | UDP | MS Theater | Windows Media Services |
| 2535 | UDP | MADCAP | DHCP Server |
| 2701 | TCP | SMS Remote Control (control) | SMS Remote Control Agent |
| 2701 | UDP | SMS Remote Control (control) | SMS Remote Control Agent |
| 2702 | TCP | SMS Remote Control (data) | SMS Remote Control Agent |
| 2702 | UDP | SMS Remote Control (data) | SMS Remote Control Agent |
| 2703 | TCP | SMS Remote Chat | SMS Remote Control Agent |
| 2703 | UPD | SMS Remote Chat | SMS Remote Control Agent |
| 2704 | TCP | SMS Remote File Transfer | SMS Remote Control Agent |
| 2704 | UDP | SMS Remote File Transfer | SMS Remote Control Agent |
| 2725 | TCP | SQL Analysis Services | SQL Analysis Server |
| 2869 | TCP | UPNP | Universal Plug and Play Device Host |
| 2869 | TCP | SSDP event notification | SSDP Discovery Service |
| 3268 | TCP | Global Catalog Server | Local Security Authority |
| 3269 | TCP | Global Catalog Server | Local Security Authority |
| 3343 | UDP | Cluster Services | Cluster Service |
| 3389 | TCP | Terminal Services | NetMeeting Remote Desktop Sharing |
| 3389 | TCP | Terminal Services | Terminal Services |
| 3527 | UDP | MSMQ-Ping | Message Queuing |
| 4011 | UDP | BINL | Remote Installation |
| 4500 | UDP | NAT-T | Local Security Authority |
| 5000 | TCP | SSDP legacy event notification | SSDP Discovery Service |
| 5004 | UDP | RTP | Windows Media Services |
| 5005 | UDP | RTCP | Windows Media Services |
| 6001 | TCP | Information Store | Exchange Server 2003 |
| 6002 | TCP | Directory Referral | Exchange Server 2003 |
| 6004 | TCP | DSProxy/NSPI | Exchange Server 2003 |
| 42424 | TCP | ASP.Net Session State | ASP.NET State Service |
| 51515 | TCP | MOM-Clear | Microsoft Operations Manager 2000 |
| 1024-65535 | TCP | RPC | Randomly allocated high TCP ports |
Download the Port_Requirements_for_Microsoft_Windows_Server_System.xls package now. (http://download.microsoft.com/download/1/5/c/15c5287d-7a49-4c83-8ce0-aea7641b1835/Port_Requirements_for_Microsoft_Windows_Server_System.xls) Active Directory port and protocol requirements
Application servers, client computers and domain controllers that are located in common or external forests have service dependencies so that user and computer initiated operations like domain join, logon authentication, remote administration, and Active Directory replication work correctly. Such services and operations require network connectivity over specific port and networking protocols.A summarized list of services, ports and protocols required for member computers and domain controllers to inter-operate with each other or for application servers to access Active Directory include but are not limited to the following.
Services on which Active Directory depends
| • | Active Directory / LSA |
| • | Computer Browser |
| • | Distributed File System |
| • | File Replication Service |
| • | Kerberos Key Distribution Center |
| • | Net Logon |
| • | Remote Procedure Call (RPC) |
| • | Server |
| • | Simple Mail Transfer Protocol (SMTP) (if so configured) |
| • | WINS (in Windows Server 2003 SP1 and later versions for backup Active Directory replication operations, if DNS is not working) |
| • | Windows Time |
| • | World Wide Web Publishing Service |
Services that require Active Directory services
| • | Certificate Services (required for specific configurations) |
| • | DHCP Server (if so configured) |
| • | Distributed File System |
| • | Distributed Link Tracking Server (optional but on by default on Windows 2000 computers) |
| • | Distributed Transaction Coordinator |
| • | DNS Server (if so configured) |
| • | Fax Service (if so configured) |
| • | File Replication Service |
| • | File Server for Macintosh (if so configured) |
| • | Internet Authentication Service (if so configured) |
| • | License Logging (on by default) |
| • | Net Logon |
| • | Print Spooler |
| • | Remote Installation (if so configured) |
| • | Remote Procedure Call (RPC) Locator |
| • | Remote Storage Notification |
| • | Remote Storage Server |
| • | Routing and Remote Access |
| • | Server |
| • | Simple Mail Transfer Protocol (SMTP) (if so configured) |
| • | Terminal Services |
| • | Terminal Services Licensing |
| • | Terminal Services Session Directory |
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