Network Solution for Windows – Windows system, Linux system, Ubuntu server configuration tip

Theoretically SSL can transparently secure any TCP-based protocol
running on any port if both sides know the other side is using SSL.
However, in practice, separate port numbers have been reserved for
each protocol commonly secured by SSL — this allows packet
filtering firewalls to allow such secure traffic through.

As of October 1998, SSL has the following port numbers reserved
with the Internet Assigned Numbers Authority (IANA), a part of the
Internet Engineering Task Force (IETF):

        Keyword         Decimal         Description
        -------         -------         -----------
        nsiiops         261/tcp         IIOP Name Service over TLS/SSL
        https           443/tcp         http protocol over TLS/SSL
        ddm-ssl         448/tcp         DDM-SSL
        smtps           465/tcp         smtp protocol over TLS/SSL
        nntps           563/tcp         nntp protocol over TLS/SSL
        sshell          614/tcp         SSLshell
        ldaps           636/tcp         ldap protocol over TLS/SSL
        ftps-data       989/tcp         ftp protocol, data, over TLS/SSL
        ftps            990/tcp         ftp, control, over TLS/SSL
        telnets         992/tcp         telnet protocol over TLS/SSL
        imaps           993/tcp         imap4 protocol over TLS/SSL
        ircs            994/tcp         irc protocol over TLS/SSL
        pop3s           995/tcp         pop3 protocol over TLS/SSL

A listing of all IANA port assignments can currently be found at
<http://www.isi.edu/in-notes/iana/assignments/port-numbers>.