![]() ![]() We already set up a firewall rule that allows SSH connections, so it should be fine to continue. You will receive a warning that says the command may disrupt existing SSH connections. Now that your firewall is configured to allow incoming SSH connections, we can enable it. ![]() For example, if your SSH server is listening on port 2222, you can use this command to allow connections on that port: If you configured your SSH daemon to use a different port, you will have to specify the appropriate port. For example, this command works the same as the one above: However, we can actually write the equivalent rule by specifying the port instead of the service name. UFW knows what SSH and a number of other service names mean because they’re listed as services in the /etc/services file. This will create firewall rules that will allow all connections on port 22, which is the port that the SSH daemon listens on by default. To configure your server to allow incoming SSH connections, you can use this command: ![]() If you’re using a cloud server, you will probably want to allow incoming SSH connections so you can connect to and manage your server. This means that we will need to create rules that explicitly allow legitimate incoming connections - SSH or HTTP connections, for example - if we want our server to respond to those types of requests. If we enabled our UFW firewall now, it would deny all incoming connections. These firewall defaults alone might suffice for a personal computer, but servers typically need to respond to incoming requests from outside users. These commands set the defaults to deny incoming and allow outgoing connections. To set the defaults used by UFW, use these commands: Let’s set your UFW rules back to the defaults so we can be sure that you’ll be able to follow along with this tutorial. ![]() This means anyone trying to reach your cloud server would not be able to connect, while any application within the server would be able to reach the outside world. By default, UFW is set to deny all incoming connections and allow all outgoing connections. These rules control how to handle traffic that does not explicitly match any other rules. There’s a rule,if you are getting started to your firewall and that is your default policies. Save and close the file now and when the UFW is enabled, it will be configured to write both IPv4 and IPv6 firewall rules.We want to insure that the firewall is configured to allow you to connect via SSH,before enabling UFW.Let’s start with setting the default policies. To do this, open the UFW configuration with nano or your favorite editor. This tutorial is written with IPv4 in mind, but will work for IPv6 as well as long as you enable it.If the Ubuntu server you have is enabled with IPv6 then ensure that UFW is configured to support IPv6 so that it will manage firewall rules for IPv6 in addition to IPv4. This tutorial will help you to set up a firewall with UFW on Ubuntu 16.04. UFW, or Uncomplicated Firewall,it’s an interface to iptables, which simplifies the process of configuring a firewall.It’s an difficulty for the beginners to learn how to use it to properly configure a firewall.Because iptables is a solid and flexible tool If you’re looking to get started securing your network, and you’re not sure which tool to use, UFW may be the right choice for you. Step 9 - Disabling or Resetting UFW (optional).Connections to a Specific Network Interface.Step 1 - Using IPv6 with UFW (Optional). ![]()
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