Joomla! Hack – Using Chrono forms with HTTPS
go to modules/mod_chronocontact/helper.php
change all JURI::base() to JURI::base( true )
This will stop Chronocontact from using default http://www.yoursite.com and use the base directory “/” which then allows Joomla to use HTTPS instead of HTTP.
Otherwise JURI will create form POST ACTION to JURI which is in HTTP.