How to Make Your Server Invisible with Knockd
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When you have a server that is publicly accessible, hackers can easily scan your IP address and check for open ports (particularly port 22 that is used for SSH) on your server. One way to hide your server from hackers is knockd. Knockd is a is a port-knock server.To prevent hackers from accessing the open ports in your Linux server, you can use Knockd to hide running services.
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