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The command you need to close the mysql port 3306 from external access. You need to use the 2 lines in the snippet below once you have connected to the server via SSH.
- iptables -I INPUT -p tcp --dport 3306 -j DROP
- /etc/init.d/iptables save
- After you've run the above command, you can undo it by editing /etc/sysconfig/iptables and running /etc/init.d/iptables restart
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