Avoid the conflict on port 80 between nodejs and apache

you need to create a virtual host in apache for your node app and proxy over the requests.

here is what mine looks like in /etc/apache/sites-available/dogself.com

<VirtualHost 69.164.218.75:80>    ServerName dogself.com    ServerAlias www.dogself.com    DocumentRoot /srv/www/dogself.com/public_html/    ErrorLog /srv/www/dogself.com/logs/error.log    CustomLog /srv/www/dogself.com/logs/access.log combined    ProxyRequests off    <Proxy *>        Order deny,allow        Allow from all    </Proxy>    <Location />        ProxyPass http://localhost:3000/        ProxyPassReverse http://localhost:3000/    </Location></VirtualHost>

It sounds like you have a lot to research before you can get this working though. start reading docs

Alternative approach for a virtual host would be the following

<VirtualHost *:80>    ServerAdmin info@DOMAIN.com    ServerName DOMAIN.com    ServerAlias www.DOMAIN.com    ProxyRequests off    <Proxy *>            Order deny,allow            Allow from all    </Proxy>    <Location />            ProxyPass http://localhost:3000/            ProxyPassReverse http://localhost:3000/    </Location></VirtualHost>

To fix the Internal Server ERROR just enable the right apache extension.

sudo a2enmod proxy_httpsudo service apache2 restart