Of course, it's webmail.mydomain.lu and not www.mydomain.lu/webmail. Sometimes you don't see the most evidents things. 🙂
awstats is a nice statistics application, that I also used on Tommy.
Because of the timeout, I switched back to port 22. To change the port: In Hestia, as admin user, push the "Servers" button, scroll down to SSH and chose "Edit". The SSH configuration file is displayed. Change the Port key from 22 into your new port and uncomment this line.
Struggling like me... In fact, my site is full functional now; did MariaDB and connection with Perl yesterday. But there are lots of admin tasks to do, for example, configuring antivirus for mail directory. Really a lots of work for just one month. But, learned a lot about Linux!