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iptables -A INPUT -p tcp --dport <port> -j DROP

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iptables -A INPUT -s <IP_address> -j ACCEPT

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iptables -A INPUT -s <IP_address> -j DROP

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yum install mod_ssl

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<VirtualHost *:443>
  DocumentRoot /var/www/html
  ServerName www.example.com
  SSLEngine on
  SSLCertificateFile /etc/httpd/ssl/www.example.com.crt
  SSLCertificateKeyFile /etc/httpd/ssl/www.example.com.key
</VirtualHost>

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systemctl restart httpd

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iptables -I INPUT -p tcp --dport 22 -i eth0 -m state --state NEW -m recent --set
iptables -I INPUT -p tcp --dport 22 -i eth0 -m state --state NEW -m recent --update --seconds 300 --hitcount 3 -j DROP

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yum install mod_security
echo "Include /etc/httpd/conf.d/mod_security.conf" >> /etc/httpd/conf/httpd.conf
systemctl restart httpd

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“Linux Firewalls: Enhancing Security with nftables and Beyond”. Steve Grubb, Jose Pedro Oliviera, and Rami Rosen. 2020.

“Web Application Firewalls: Detection and Prevention of Web Application Attacks”. Ryan C. Barnett. 2007.

“Artificial Intelligence and Security: Future Directions”. Yiannis Kelemenis, Spyros Makridakis, and Nicos Pavlidis. 2021.

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