How To Fix CSF Error open3: exec of /usr/bin/systemctl is-active firewalld failed
As we know that since version 13.05 was released to the public, CSF (ConfigServer Security & Firewall) has fully supported VestaCP with user interface integration. However, if you configure VestaCP and CSF on the Ubuntu 18.04 LTS server you might get the same error message … Read more