It's not possible to remove the port without getting dirty ...
A long time ago, I used to do this with proxy (here's how)
In many cases esp. in Africa, you find port 8443 by most ISPs blocked. Below is a miracle way of allow clients in such situations access there control panel.
Firstly,
We create a server domain in plesk, eg: loft1234.theg7.com
Secondly (You might need to make a few adjustments here ...):
Code:
vim /var/www/vhosts/system/conf/loft1234.theg7.com/conf/vhost.conf
And add the following contents:
Code:
SSLProxyEngine on
ProxyRequests off
ProxyPass / http://loft1234.theg7.com:8443/
ProxyPassReverse / http://loft1234.theg7.com:8443/