Avira Premium Internet Security contains a firewall program that blocks unwanted or dangerous Internet traffic from your computer. The firewall has default settings to allow safe traffic to pass to your computer, e.g., Hypertext Transfer Protocol (HTTP) on port 80 or File Transfer Protocol (FTP) on port 21, but blocks unknown or unauthorised ports. You can add a firewall rule to configure Avira to allow open ports for applications that are not covered by the default settings.
Click the Windows "Start" menu, click "All Programs" and scroll to "Avira." Click the icon and select "Start AntiVar." You can also right-click the Avira icon in the system tray and select "Start AntiVar."
Click the "Online Protection" tab and select "Firewall." Above the list of applications that the firewall is monitoring, click "Configuration."
Double-click "Firewall" from the menu on the left and click "Adapter Rules." Highlight "Incoming Rules" and click "Add Rule." Follow the prompt to give the new firewall rule a name. For easy identification use the name of the application or the port number you are allowing, for example "Bouncing Bubbles Game" or "Port 105." Select "Incoming TCP Rule" and click "OK."
Click "Outgoing Rules" to create a new rule for outgoing traffic. Click "Add Rule," name the rule and select "Outgoing TCP Rule." Click "
Avoid opening unnecessary ports that can be used to exploit your system. If you no longer use an application that requires a custom port to be open, delete the firewall rule to close the port.