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How to allow incoming SSH connections from a specific IP address or subnet using UFW on Ubuntu Linux

How do I allow incoming SSH connections from a specific IP address or subnet on a Ubuntu or Debian Linux server using ufw?

UFW is an acronym for uncomplicated firewall. It is used for managing a Linux firewall and aims to provide an easy to use interface for the user. In this tutorial, you will learn how to use UFW a frontend to iptables for opening incoming SSH connection on Ubuntu Linux 16.04 LTS or Debian Linux server.

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