cronjob solved: execute cronjob every 3 weeks although crontab is able to schedule intervals (i.e. */2 * * * * command.sh for every 2 minutes), it is not able to schedule every 3 weeks. the solution is to add some calculations (using
letsencrypt let's encrypt on uberspace let's encrypt (homepage) is in open beta right now (read announcement) and as always, uberspace is bleeding edge and „supporting“ let's encrypt. please take a moment an read their blog post. set up