Manage these settings at:
Settings → Troubleshooting
Advanced users can change these settings to resolve some specific problems.
Click Reset now to restore your Avast settings to the original default settings. After resetting you can adjust as needed.
If the standard ports are not used for your email and web communication, specify here which ports are used. This is important to ensure that your emails and web browsing are monitored by Avast.
For the Web, Avast normally monitors only communication through port 80. If you use a proxy server to access the Internet you must enter the port used to connect to the proxy server so that communications between the proxy server and your computer to be scanned. Only enter the ports for HTTP traffic, not for ICQ,DC++ etc. For Mail, the default ports are the standard port numbers for the four basic email protocols. If you use a different port (or ports) you must enter them here. Use commas to separate multiple port numbers in the list.