Ports Used by Exchange Server 2003
Port number Service 25 Simple Mail Transfer Protocol (SMTP) 80 HTTP 88 Kerberos 102 MTA - X.400 connector over TCP/IP 110 Post Office Protocol (POP3) 119 Network News Transfer Protocol (NNTP) 135 Client/server communication
RPC
Exchange administration143 IMAP 389 LDAP 443 HTTPS (SSL) 563 NNTP (SSL) 636 LDAP (SSL) 993 IMAP4 (SSL) 3268 Global Catalog 3269 Global Catalog
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