Apache

Apache hardening: https://wiki.zoneminder.com/Ubuntu_Install_ZoneMinder_on_Ubuntu_Server

Eliminate Error Pages

Append this:

Contents of /etc/apache2/apache.conf

ErrorDocument 400 /error555.html ErrorDocument 401 /error555.html ErrorDocument 404 /error555.html ErrorDocument 403 /error555.html ErrorDocument 500 /error555.html ErrorDocument 502 /error555.html ErrorDocument 503 /error555.html ErrorDocument 504 /error555.html

Contents of /var/www/html/error555.html

Just a blank file.

Misc

enable / disable ssl (listen on port 443)

a2enmod ssl
a2dismod ssl

enable / disable certain php vers

a2enmod php5.6
a2dismod php5.5