Linux Administrator - Block a specific incoming port

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Block a specific incoming port

Block a specific incoming port

Let's say you want to block ftp traffic on a temporary basis, but you don't want to shut down the ftp server. That's where a temporary block would come in handy. You can do this with the trusty iptables tool. Use a line like this:

/sbin/iptables -A INPUT -p tcp --destination-port 21 -j DROP

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