Minimal UFW Setup
UFW (Uncomplicated Firewall) is a firewall software package that is easy to use initially and yet flexible enough for power users.
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There is much more to UFW but the above steps should get you going.
More UFW Commands
Here are some more useful ufw commands,
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sudo ufw deny 443 # Disables and leave the entry in the status. Useful for a port you leave on and off sometimes. sudo ufw delete allow port 443 # Actually delete the firewall rule entry. Note you must have it enabled to delete it. |
Article Improvements
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This article can be improved in the following areas. |
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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.