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:
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.
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