Some firewalls will not permit applications such as Skype (or any applications you have not specifically allowed) to access the internet. Generally, the first time Skype or another application tries to access the internet, you will be asked if you would like to allow that application access. If you accidentally clicked No on that message (or if your firewall never asked for permission), you will not be able to use Skype until you configure your firewall to allow Skype to access the internet.
You may also need to configure the ports that Skype uses for incoming connections. For help with that, see which ports need to be open to use Skype?
All firewalls are a bit different, but the process for configuring your firewall to allow Skype to work is usually as follows:
- Make sure that Skype is not running.
- Open your firewall. If you can't find your firewall application, check the System Tray (at the bottom-right corner of the screen) for an icon. Usually, you can right-click this icon and select to open the firewall.
- Your firewall maintains a list of applications installed on your computer (usually under a heading like Settings or Program Control). In this list, locate the entry for Skype.
- Configure the Skype entry to allow it to connect to the internet.
- Save your changes.
- Restart Skype and sign in.
For comprehensive instructions on using your firewall software, refer to the software developer’s website.
If you're using Windows Firewall and have just reinstalled or upgraded Skype, you may need to update your Windows Firewall settings.
Learn more about Skype security.