WebRTC leak
A WebRTC leak is when the browser tells a site your real IP address, bypassing the proxy.
WebRTC is a browser technology for calls and video right on a page. To connect two people, the browser finds out its own network addresses and may pass them to the site.
The request for these addresses does not travel the way a normal page load does, and with some settings it bypasses the proxy. The site gets your real address even though the page is opened through a proxy.
You can check this on the WebRTC leak test page: it shows which addresses a site sees.
In antidetect browsers WebRTC usually adjusts to the proxy address automatically. In a regular browser it is turned off with a setting or an extension.
FAQ
How do I know if there is a leak?
Open the WebRTC leak test through the proxy. If the result shows your real address, there is a leak.
Can a leak happen without calls or video?
Yes. A site can request addresses through WebRTC in the background, even if you did not turn anything on.
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