Hello,
I'm using X11 forwarding capabilities in order to work on the server (if I ever need to be "local").
It is quite simple to do...
From an Ubuntu desktop:
Replace
<admin> with your username
<your Zentyal IP> with your server IP or domain name
ssh -X -C <admin>@<your zentyal IP>
* The -X is the X11 Forwarding and the -C is for compression *
After that you only have to fire up Firefox or any other software and done - your now working "local" without even getting close to your server!
Hope it will help...
Best,
Marcus