Need UFW help

[deadbob]

I am new to all linux distros. I have been having a great experience so far but I cannot figure out an issue I am having with UFW. When I try and make a rule, under applications there is only "CUPS". I do not have any applications called CUPS and all my other apps are not listed. Even in the konsole when I list out the apps there is only CUPS; sudo ufw app list

Any suggestions?

[Snowhog]

Welcome to KFN.

What version of Kubuntu are you running?

[deadbob]

Welcome to KFN.

What version of Kubuntu are you running?

Sorry I should have included that;

UFW Version: ufw 0.36.2

System info:
Operating System: Kubuntu 24.04
KDE Plasma Version: 5.27.12
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.13
Kernel Version: 6.14.0-35-generic (64-bit)
Graphics Platform: X11
Processors: 16 × 12th Gen Intel® Core™ i7-12650H
Memory: 15.3 GiB of RAM
Graphics Processor: Mesa Intel® Graphics
Manufacturer: LENOVO
Product Name: 82S9
System Version: IdeaPad Gaming 3 15IAH7

[Snowhog]

CUPS - https://en.wikipedia.org/wiki/CUPS It is part of every Linux OS installation.

How are you using ufw? From the command line, or are you using the graphical interface, gufw?

[oshunluvr]

Only seeing CUPS is normal until you add more rules to UFW. The command "sudo ufw app list" list the apps that have specific rules, not all apps on your system.

For example I have added a rule to allow SSH connections using "OpenSSH". So when I enter "sudo ufw app list", I see:

Available applications:
CUPS
OpenSSH​

On my server I get:

Available applications:
Apache
Apache Full
Apache Secure
Samba
iperf3
plexmediaserver
plexmediaserver-all
plexmediaserver-dlna​

[deadbob]

CUPS - https://en.wikipedia.org/wiki/CUPS It is part of every Linux OS installation.

How are you using ufw? From the command line, or are you using the graphical interface, gufw?

I am trying to change it in the settings with the graphical interface, I only checked the terminal when I was having issues.

[deadbob]

Only seeing CUPS is normal until you add more rules to UFW. The command "sudo ufw app list" list the apps that have specific rules, not all apps on your system.

For example I have added a rule to allow SSH connections using "OpenSSH". So when I enter "sudo ufw app list", I see:

Available applications:
CUPS
OpenSSH​

On my server I get:

Available applications:
Apache
Apache Full
Apache Secure
Samba
iperf3
plexmediaserver
plexmediaserver-all
plexmediaserver-dlna​

How am I supposed to add more applications if I cant see what is available to add?

[Snowhog]

This video tutorial may be helpful for you: How to Install and Use GUFW Firewall on Ubuntu | Linux Mint

It is done for Linux Mint, but that won't matter. It will be the same for Kubuntu.

[deadbob]

A bit different from what's in the video, but when they click the dropdown menu there are available applications, unlike mine, here is a screenshot https://imgur.com/a/ogoMdID

[Snowhog]

You are using the default Firewall application. If you haven't installed gufw, do so, then launch Firewall Configuration. Then you can follow the video.

[deadbob]

You are using the default Firewall application. If you haven't installed gufw, do so, then launch Firewall Configuration. Then you can follow the video.

Got it, OK I installed the GUFW but I am still having issues, the video was simple to follow but either I am missing something or misunderstanding this completely. In the new GUFW I installed and opened I found the rules and application list but its full of stuff I dont have installed and missing stuff I do have installed, so I'm kind of in the same boat. So essentially I want to block all outgoing traffic except for SSH and Brave Browser, my thought process was I dont want any other apps connecting to the web and sending any unnecessary data.

I appreciate the help but I think im going to put this on the back burner for now.