Changing Apache2 Default Port in UBUNTU

Task: Change Apache port

Open /etc/apache2/ports.conf file, enter:

# vim /etc/apache2/ports.confOR

$ sudo vim /etc/apache2/ports.conf
To make the server accept connection on  port 81, enter:
Listen 81

Save and close the file And Open /etc/apache2/sites-enabled/000-default  :

# vim /etc/apache2/sites-enabled/000-default< VirtualHost *:80>  TO < VirtualHost *:81>

Save and close the file. Restart Apache 2 web server:

# /etc/init.d/apache2 restart
OR
$ sudo /etc/init.d/apache2 restart