rkhunter running twice on Debian
When rkhunter is installed on Debian it also installs a cron.daily and cron.weekly script. The first will run rkhunter on a daily basis, the second will update it weekly. ispconfig running rkhunter every day again including the --update parameter.
Either ispconfig should detect if rkhunter is run automatically by the systems (probably difficult) or at least have a configuration switch to disable internal run of rkhunter. In this case, a time should be configured when ispconfig shall read rkhunter.log in its internal monitoring database.