Port 22 is generally used for SSH traffic. If you configure another application besides the SSH daemon to listen on that port, make sure to configure SSH to listen on a different port first. If not, you may lose access to the server.

If you really want to configure Apache to listen to port 22, you must add or edit a VirtualHost to do so as well as configure a Listen directive. The port that Apache will respond on is configured

Listen 22

<VirtualHost *:22>
    ServerAdmin webmaster@localhost
    DocumentRoot /var/www/html
    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

For more information on configuring Apache, check out:

• How To Set Up Apache Virtual Hosts on Ubuntu 16.04

To learn more about SSH, see:

• SSH Essentials: Working with SSH Servers, Clients, and Keys