How to bind the OX-application to another port?

Hi.
Tell me please, how to bind OX to another port? I want to forward the port ONLY to OX on my router, so that other applications are not available from the Internet.

I understand correctly that you need to change the file settings:
/etc/univention/templates/files/etc/apache2/sites-available/ox.conf

And add at the beginning something like this:
< IfModule mod_ssl.c >
< VirtualHost *: 9443 >
<------> SSLEngine on
<------> SSLProxyEngine on
<------> SSLProxyCheckPeerCN off
<------> SSLProxyCheckPeerName off
<------> SSLProxyCheckPeerExpire off

and at the end of the file
</ VirtualHost >
</ IfModule >

Thats good idea?