As a security measure against online threats, Avast Internet Security uses a firewall to monitor incoming and outgoing traffic. It can, however, detect false positives for certain applications and prevent them from accessing the Internet. To make these applications work normally, you can either disable the Avast firewall, or add the applications as exceptions to the Avast firewall.
Disable Avast Firewall
1. Open Avast Internet Security, and then click Settings.
2. Under Active Protection, click ON and then select an option from the drop-down menu: Stop for 10 minutes, Stop for 1 hour, or Stop until restart of computer to disable the Avast firewall for the specified time period. Select Stop permanently to disable the Avast firewall indefinitely. Click OK to save the changes.
Add Firewall Exceptions
1. Open Avast Internet Security, click Tools, and then click Firewall.
2. Click Application Rules.
3. Click New Group, enter a name for the group, and then press Enter.
4. Click New Application Rule, and then select the newly created group.
5. Browse to the location of an application, select the application's main executable file, and then click Open.
6. The application appears under the selected group. Next to the application, click and drag your cursor over the five orange bars until the status changes to All Connections. Click Close to save the changes.