$sudo a2enmod ssl
$sudo a2ensite default-ssl
modify /etc/apache2/sites-available/default-ssl.conf
$sudo systemctl restart apache2
check open ports:
$nc -zv young.hanyang.ac.kr 80
$netstat -tlnp
$nmap -sT hostname
$sudo lsof -nP -iTCP -sTCP:LISTEN
$sudo ufw status
$sudo ufw help
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