1. Login to Cerb4 on a SSL-enabled server, https://myhost/helpdesk
2. Enable the community tools plugin (affects support center too from what I can tell)
3. Add a new community
4. Review the "Installation" section, index.php
5. REMOTE_HOST is defined as 'myhost.com:443'
6. On line 230, see $url = 'http://' ... etc
7. On line 249, see $url = 'http://' ... etc
Had trouble getting this to work, decided to just use http - but I think you'll need to change the $url variable to https if SSL is detected.
* [Community Tools] Improved the community tools proxy (the deployed index.php file) so it can handle back-end helpdesks that are running in SSL or are on non-standard ports (with or without SSL). 8080/8443 should be supported, as well as the typical 80/443, or any intranet variety. To benefit from this you need to replace your deployed community tool index.php files with the code generated in the "Installation" section from Helpdesk Setup->Community Tools.