ozzloy% sudo apache2ctl start
[sudo] password for ozzloy:
[Mon Jul 15 09:55:08 2013] [crit] (22)Invalid argument: alloc_listener: failed to get a socket for (null)
Syntax error on line 9 of /etc/apache2/ports.conf:
Listen setup failed
Action 'start' failed.
The Apache error log may have more information.
ozzloy% cat /etc/apache2/ports.conf|head -n 13
# If you just change the port or add more ports here, you will likely also
# have to change the VirtualHost statement in
# /etc/apache2/sites-enabled/000-default
# This is also true if you have upgraded from before 2.2.9-3 (i.e. from
# Debian etch). See /usr/share/doc/apache2.2-common/NEWS.Debian.gz and
# README.Debian.gz

NameVirtualHost *:80
Listen 80 # <<-- line 9

<IfModule mod_ssl.c>
    # If you add NameVirtualHost *:443 here, you will also have to change
    # the VirtualHost statement in /etc/apache2/sites-available/default-ssl