Minimal UFW Setup
UFW (Uncomplicated Firewall) is a firewall software package that is a front-end to iptables that is easy to use initially and yet flexible enough for power users.
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sudo ufw enable |
From your desktop, use Telnet to confirm 22 port is open,
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telnet Ubuntuservername 22 # if you server is not named, user the server's IP address |
If telnet worked you should see something like this,
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Connected to Ubuntuservername.
Escape character is '^]'.
^] |
Finally check that all your rules are in place,
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There is much more to UFW but the above steps should get you going.
Removing Rules
You can disable or delete rules. The example shown here is two step,
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sudo ufw delete allow 443 # Deletes an enabled rule. |
To put comment
You can put comment in the rules and have it show up in the ufw status
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sudo ufw allow 22 comment 'enable TCP' |
Article Improvements
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This article can be improved in the following areas. |
How I can put comments in the firewall rules and have it show up in the ufw status? Using applications.d. Will add details from here,http://manpages.ubuntu.com/manpages/jaunty/en/man8/ufw.8.html
Do you really need to enable the port to delete it? That was the only way the command worked for us, but then again we might have to use a different syntax for deleting a disabled port.
References
https://help.ubuntu.com/9.10/serverguide/C/firewall.html - official docs from Ubuntu.