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The following table lists Exchange Server 2003 services and their corresponding ports. For more information about how to configure Exchange front-end servers, including the ports that are associated with various scenarios, see the technical article, Using Microsoft Exchange 2000 Front-End Servers. Although that article relates to Exchange 2000 Server, the information applies to Exchange Server 2003 as well.
Ports used in Exchange 2003
| Services (dependencies) | Ports inbound | Ports outbound (initiate connections to) | Notes |
|---|---|---|---|
Microsoft Exchange System Attendant |
135 & other RPC Other ports required for RPC over HTTP |
All core Exchange services require the Microsoft Exchange System Attendant. For more information about RPC over HTTP port configuration, see the guide Exchange Server 2003 RPC over HTTP Deployment Scenarios. |
|
Microsoft Exchange Information Store (Microsoft Exchange System Attendant) |
135 & other RPC Other ports required for RPC over HTTP |
User Datagram Protocol (UDP) packets to random ports for new mail notification |
Runs the Exchange databases. For more information about RPC over HTTP port configuration, see the guide Exchange Server 2003 RPC over HTTP Deployment Scenarios. |
Microsoft Exchange MTA Stacks (Microsoft Exchange System Attendant) |
135 & other RPC 102 for X.400 over TCP |
135 & other RPC 102 for X.400 over TCP |
Microsoft Exchange MTA Stacks are required for legacy connections to Exchange Server 5.5 servers. Port 102 opened only for active X.400 connections. |
Simple Mail Transfer Protocol (SMTP) (IIS Admin Service) |
25 |
25 |
Exchange store requires SMTP |
Microsoft Exchange Routing Engine (IIS Admin Service) |
691 |
691 |
Routing Engine service |
World Wide Web Publishing Service (IIS Admin Service) |
80 & 443 |
80 on the front-end server |
Required for Outlook Web Access and public folder administration |
Exchange ActiveSync (IIS Admin Service) |
|
UDP 2883 on the front-end server |
Required for SP2 Exchange ActiveSync Direct Push |
Microsoft Exchange POP3 (IIS Admin Service) |
110 & 995 (SSL) |
110 on the front-end server |
Required for POP3 access |
Microsoft Exchange IMAP4 (IIS Admin Service) |
143 & 993 (SSL) |
143 on the front-end server |
Required for IMAP4 access |
Network News Transfer Protocol (NNTP) (IIS Admin Service) |
119 & (563 SSL) |
N/A |
|
Microsoft Exchange Site Replication Service |
379, 135 & other RPC |
135 & other RPC |
Depends whether Exchange Server 5.5 servers are in the organization. |
Active Directory Connector |
NA |
379, 389, can be configured |
Depends whether Exchange Server 5.5 servers are in the organization |
Microsoft Exchange Event (Microsoft Exchange Information Store) |
Not automatic by default |
||
Exchange Management (Windows Management Instrumentation) |
This is not a required service; however, Microsoft Operations Manager and other programs do not function without this service. Note Port 445 is required for Message Tracking |