I found that the information on the tab SSL under "Web Domain" was not really helpful. Therefor I decided to extend it a little. I opened a bug report for this as well. But till now nobody reacted to it: http://bugtracker.ispconfig.org/index.php?do=details&task_id=1175 I attach now my update to this post. If you want to use it in the next update, feel free to do it. The text is maybe not 100% correct but in my opinion already a lot more helpful than the current version of the screen.