Port scan protection
You can enable "Port scanning protection" in browser profile settings, which will prevent websites from checking your system for open ports. You can also customize this setting by adding ports that websites can scan.
In computer science, a port is a communication endpoint. When an application is running on the computer, it opens a port. This port acts as an address using which applications can interact with each other.
Here are a few examples:
- TeamViewer opens the following ports: 80, 443 and 5938 (TCP)
- RDP (Remote Desktop Protocol) opens this port: 3389 (TCP and UDP)
Websites that utilize local open port scanning through web sockets can see what ports are open in a particular computer, and as a result, understand what program our users are running. According to our research, Facebook, eBay, and Amazon are using this fingerprinting method.