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How to open your firewall remotely only for you

Now I have found another way, you may have your firewall closed by default, but you will be able to open it when you need to access your server, and closed it again after use, the package that will do the magic is knockd, and as its name says, you will knock the door of the firewall and it will open itself for you, but you will need a secret type of knock, it is like the “Open/Close, Simsim” (Open/Close sesame). More here

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