I understand the Ubuntu comes with firwallul UFW is true? There is a GUI for it? if so, what is his name and where do I download? It is possible that UFW notify us (like in windows with a pop-up windows)when someone wants access to your pc or when an application wants to go out on the internet? Is there any firewall for ubuntu notify you when someone wants access to your PC or when an application wants to access the Internet?
If you want to change any settings, you can use the graphical front end to that command line front end, GUFW .
As for your other question, getting a warning when an application connects to the internet:
I don't know of any programs that do this*, but I have written one. Now, this isn't great quality software - it's a quick hack in fact -but it works all right. You'll notice I haven't packaged it in any way, because I don't have any use for it and I don't think its tested well enough to be deployed on Anything That Matters™
It doesn't even have a name, here's how it looks:
And here's how to use it:
The program will issue a warning for every application that tries to access the internet. It will not prevent it from doing so, but it'll let you know. You then have the option of putting it on a "White List" of trusted applications, which causes it to not warn you again about this particular program.
If you start it from a terminal, you'll get a few useful messages about what it's doing.
Again I have to stress, even though it works, I haven't tested it properly (i.e. with many users trying it out).
For the purposes of support, you may send me email about it, I don't mind
*: It seems UFW is able to do it!
This section is really better suited for someone managing servers than for desktop users:
UFW comes with an Application Filter. It's configuration is a simple text file at
To get a list of all the application filters, type
Which should look like this:
To get more details on any one application, type - for example:
More details are available in the relevant Ubuntu Wiki page.
As for the question of default configuration: By default, Ubuntu ships with no open ports on public interfaces (source).
Question 1.- here
Question 2.- as i far i know there isn't any tool for notification when someone wants access to your pc or when an application wants to go out on the internet? maybe that will be a feature for GUFW