Windows Vista has a firewall derived from Windows XP SP2. It acts as a protective shield between your PC and the outside world. In order to enter, doors must be opened filtering traffic. Although many traffic rules are natively predefined, some programs need to be set manually. Here’s the procedure!
The purpose of this tutorial is to show you how to add an exception to Vista’s firewall to allow Vista to interact with the outside world (e.g. Internet). Note also that only incoming connections will be blocked when you add an exception. If you want to block outgoing connections, refer to the link in the next paragraph.
However, if you want to deepen the use of the firewall — especially by using Vista’s advanced firewall, I recommend reading this article that will transform your PC into a true fortress: Use Windows Vista Advanced Firewall.
Addition of an exception to the firewall
Open the start Menu then enter firewall. Then click on the link Windows Firewall.
You can also access it via Control Panel or by clicking on the Security Center icon in the notification area.
In the main window, click on Modify Settings. Check now that the box Enabled (recommended) is beautiful and well checked.
Then go to the tab Exceptions.
This list lists all the programs allowed to pass through the firewall. You should recognise some of them for which permission must have been sought from you.
To add an additional program — or a port, click on Add a program...
Then specify the software in question from the proposed list and click on OK.
Add as many exceptions as necessary while remaining consistent: programs that you are not aware of and which expressly request such authorisation should be considered suspicious! A small Google search will prevent you from committing the irreparable!
When you are finished, validate by clicking on OK.
Now that you know how to allow incoming connections of some programs — by adding an exception, remember that the only real barrier is the user you are!