I'm suddenly having tons of errors and cannot find why. All is working. Sites working, no problem on database, also when I check service apache2 and mysql I get active and running without any error report. Why is ispconfig writing theses mass errors ? What I already did for to debug: 1) I've already udated ispconfig, incl. SSL cert. 2) Checked error.logs of apache2 and mysql - no errors but warnings for apache: AH00548: NameVirtualHost has no effect and will be removed in the next release /etc/apache2/sites-enabled/000-ispconfig AH00112: Warning: DocumentRoot [/dev/null] does not exist What I observed is that there was an attack to port 8081 last night, but not successful (404 errors). How to get rid what is happening and where exactly ? Perhaps there is a changed file I've changed before and after reboot of the system the error is applying ? How to locate for changed files in the last 3 days for ubuntu 16.04. ?