My app shows code like in maintenance mode after installing SSL in VPS.
here is the command I run :
$ apt-get update -y
$ apt-get upgrade -y
$ reboot
$ apt-get install nano perl wget -y
$ cd /usr/src
$ wget https://download.configserver.com/csf.tgz
$ tar -xzf csf.tgz
$ cd csf/
$ sh install.sh
$ nano /etc/csf/csf.conf
$ csf -r
$ add-apt-repository ppa:certbot/certbot
$ apt-get install python-certbot-apache -y
$ certbot --apache
nano /etc/letsencrypt/options-ssl-apache.conf