Hello, since a few days I got a lot of trouble with error messages containing: stapling_renew_response: responder error when visting certain sites with Firefox clients. I am using ISPConfig3 with Ubuntu 16.04 LTS and apache2. The only thing what solves the problem for me is to set "SSLUseStapling off" to the *.vhost file of the domain. Now I worry that ISPConfig will reset it on any update I do inside ISPConfig or when updating ISPConfig. How can this setting be permanent? By the way, in which cases the vhost file for a domains gets updated? Thank you and best wishes!