Common ports used by Exchange
I can never remember most of the ports that Exchange uses - apart from Ports 25(SMTP), 389 (LDAP) and 443(SSL) which seemed to be burned into my brain somehow. It's funny, as I used to be able to remember almost all of the ports in the file in NT4's Winnt\system32\dtivers\etc\services file off by heart (blush). So I was geting quite irate trying to work out why my global catalog wasn't servicing any requests (it listens on ports 3268 and 3269) It took me AGES to find out this information, and I finally found it on the Exchange Transport and Routing guide. so I've copied the table here, as much for my benefit as anything else - so I can find it again :-)
Table A.3 lists the ports commonly used by Exchange. For more information about which ports need to be opened internally or externally, see the book Using Microsoft Exchange 2000 Front-End Servers (http://go.microsoft.com/fwlink/?LinkId=12055).
Table A.3 Ports used by Exchange
| Protocol | Port | Description | | |
| SMTP | TCP: 25 | The SMTP service uses TCP port 25. | | |
| DNS | TCP/UDP: 53 | DNS listens on port 53. Domain controllers use this port. | | |
| LSA | TCP: 691 | The Microsoft Exchange Routing Engine service (RESvc) listens for routing link state information on this port. | | |
| LDAP | TCP/UPD: 389 | Lightweight directory access protocol (LDAP) used by Microsoft Active Directory® directory service, Active Directory Connector, and the Microsoft Exchange Server 5.5 directory use this port. | | |
| LDAP/SSL | TCP/UDP: 636 | LDAP over Secure Sockets Layer (SSL) uses this port. | | |
| LDAP | TCP/UDP: 379 | The Site Replication Service (SRS) uses this port. | | |
| LDAP | TCP/UDP: 390 | This is the recommended alternate port to configure the Exchange Server 5.5 LDAP protocol when Exchange Server 5.5 is running on an Active Directory domain controller. | | |
| | | |
| LDAP | TCP: 3268 | Global catalog. The Windows 2000 and Windows Server 2003 Active Directory global catalog (a domain controller "role") listens on TCP port 3268. | | |
| LDAP/SSLPort | TCP: 3269 | Global catalog over SSL. Applications that connect to TCP port 3269 of a global catalog server can transmit and receive SSL encrypted data. | | |
| IMAP4 | TCP: 143 | Internet Message Access Protocol (IMAP) uses this port. | | |
| IMAP4/SSL | TCP: 993 | IMAP4 over SSL uses this port. | | |
| POP3 | TCP: 110 | Post Office Protocol version 3 (POP3) uses this port. | | |
| POP3/SSL | TCP: 995 | POP3 over SSL uses this port. | | |
| NNTP | TCP: 119 | Network News Transfer Protocol (NNTP) uses this port. | | |
| NNTP/SSL | TCP: 563 | NNTP over SSL uses this port. | | |
| HTTP | TCP: 80 | HTTP uses this port. | | |
| HTTP/SSL | TCP: 443 | HTTP over SSL uses this port. | | |