So, I have the following setup:

internal.my.net = zimbra running with SSL internally (no apache), it works ok from our local network.
external.my.net is an SSL apache2 server doing ProxyPass to the internal network, following the guide here ZimbraApache - ZimbraWiki, like:
Code:
    ProxyPass / https://internal.my.net/
    ProxyPassReverse / https://internal.my.net/
The problem is: if I access internally the https://external.my.net/zimbra url I get the login page, I fill user name and login and then my browser is redirected to 'https://internal.mds.net' that obviously can't be accessed externally. If I use the 'low fi' zimbra interface (/zimbra/h) it works perfectly, what makes me thing that maybe something in the Javascripts are doing the redirect.

Any tip? How I can disable this redirect thing (I tried ?redirect=0, but no game). Running in debug mode shows me an empty login screen (no fields or whatsoever).

thanks.