How to Close/Restrict a Port on a Linux Server Using CSF and Iptables

Using CSF (ConfigServer Security & Firewall)

1. Block a Specific Port

   nano /etc/csf/csf.conf

   Remove the port you wish to close (e.g., 8080) from TCP_IN and TCP_OUT.

2. Restart CSF to Apply Changes

   csf -r

Using Iptables

1. Delete Rule for a Specific Port

   iptables -D INPUT -p tcp --dport 8080 -j ACCEPT

2. Save Changes

   sudo netfilter-persistent save

    

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