Apache Reference: http_core, Port
Canonical Port Number
Syntax: Port A
Example: Port 8080
Since: Apache 1.0
This directive configures the canonical port of the server
(in addition to the ServerName directive, which configures
the canonical host name). A Port setting never affects
the ports on which a <VirtualHost> actually responds; the
<VirtualHost> and Listen directives are used for that
purpose. The number argument is a numerical value ranging
from 0 to 65535. The standard port for the HTTP protocol
is 80. All ports numbered below 1024 are reserved for system
use under UNIX. That is, regular (non-privileged) users cannot
use them; instead, they can use only higher port numbers. To
use such low-numbered ports, one must start the server from the
``root'' account.