WebRTC Leak: How to Check and Configure WebRTC with a Proxy

Your proxy is connected and your IP address has changed, but websites still ask you to complete CAPTCHAs, log in again, or verify your account? One possible reason is a WebRTC leak.

Due to the way WebRTC works, under certain configurations a website may be able to detect an IP address outside the regular proxy connection. As a result, your main traffic goes through the proxy while WebRTC exposes a different public IP.

Simply disabling WebRTC is not always the best solution. When using an antidetect browser, it is better to configure WebRTC so that it does not expose your real IP and remains consistent with your proxy IP.

In this guide, we’ll explain what a WebRTC leak is, how to detect it, and how to configure WebRTC correctly.

What Is WebRTC?

WebRTC (Web Real-Time Communication) is a technology that allows browsers to exchange audio, video, and other data in real time.

It is used for video calls, voice calls, screen sharing, and other features that require real-time communication.

To establish a connection, WebRTC identifies available network routes. It does this using ICE candidates – potential addresses through which the browser can establish a connection.

Under certain configurations, this process can expose an IP address that differs from the IP of the proxy you are using.

What Is a WebRTC Leak?

A WebRTC leak occurs when WebRTC exposes network information to a website that should remain hidden while you are using a proxy.

For example:

Regular connection: Proxy IP
WebRTC: Real public IP

This means the website receives conflicting network signals from the same browser profile.

This is particularly important when managing multiple accounts with antidetect browsers, where keeping profile parameters consistent matters.

However, not every IP address or value shown in a WebRTC test indicates a leak. Modern browsers can hide local IP addresses using mDNS. The main thing to check is whether the real public IP address of your internet connection is being exposed.

Why WebRTC Can Expose Your Real IP When Using a Proxy

During regular web browsing, the connection generally looks like this:

Your device → proxy → website

The website sees the proxy IP.

However, WebRTC uses its own connection mechanisms. This means that when you use an HTTP or SOCKS proxy, WebRTC traffic does not always follow the same route as regular browser requests.

As a result, you may end up with:

HTTP/HTTPS → Proxy IP

WebRTC → Different public IP

In other words, the proxy itself may be working correctly and changing your IP for regular traffic, while the issue occurs specifically at the WebRTC level.

Why WebRTC Leaks Can Be a Problem

A WebRTC leak does not necessarily mean your account will be blocked. Websites and anti-fraud systems typically analyze multiple signals at once.

However, if your browser’s main IP belongs to the proxy while WebRTC exposes a different public IP, this creates an inconsistency within the profile.

Depending on the website, this may become an additional risk signal and lead to:

• frequent CAPTCHAs;
• repeated login requests;
• additional identity verification;
• extra checks during payments;
• account restrictions.

So if you are experiencing account stability issues, it is worth checking not only the quality and reputation of your proxy IP, but also your WebRTC configuration.

How to Check for WebRTC IP Leaks

After connecting to a proxy, check whether WebRTC is exposing your real IP address. You can use the free IPrify service for this.

Open ⁠https://iprify.com in the same browser profile where your proxy is configured.

Pay attention to two lines on the page:

1. IP address – this should show the public IP of the proxy you are using.
2. WebRTC – this should show the same IP address.

If the values match, WebRTC is being spoofed correctly and your real public IP is not exposed. We’ll explain below what to do if nothing appears in the WebRTC field (= WebRTC is disabled).

Here is an example of a correct configuration:

Public IP: 185.195.66.38
WebRTC: 185.195.66.38

If the WebRTC line shows your real IP or another IP address, you need to adjust your WebRTC settings.

How to Fix a WebRTC Leak

If you are using an antidetect browser, configure WebRTC spoofing based on your proxy IP.

Depending on the browser, this feature may be called Altered, Replace, Spoof, Mask, or something similar. With WebRTC spoofing enabled, the browser exposes an IP address that matches the proxy instead of your real IP.

As a result, the network parameters of your profile remain consistent:

Browser IP → Proxy IP
WebRTC → Proxy IP

After changing the settings, check WebRTC again using IPrify. Your public IP and WebRTC IP should match and correspond to the proxy IP you are using.

Why It’s Better to Spoof WebRTC Than Disable It

This raises an obvious question: if WebRTC can expose your IP, why not simply disable it?

Technically, you can, but completely disabling WebRTC is not the best option for antidetect use cases.

WebRTC is a standard technology in modern browsers and is typically enabled for regular users. Completely disabling WebRTC can therefore make your browser fingerprint look less natural and create another difference from a typical user profile. Some website features may also stop working properly without WebRTC.

That’s why when using an antidetect browser, it is better to spoof WebRTC data to match your proxy IP rather than block WebRTC entirely.

The goal is to maintain a natural, consistent browser fingerprint without exposing your real IP.

What Else to Check Besides WebRTC

Even a correctly configured WebRTC setup does not guarantee stable account performance. It is only one part of your browser profile.

You should also check:

• proxy IP address;
• DNS;
• IPv4 and IPv6;
• browser geolocation;
• time zone;
• language and locale;
• fingerprint settings in your antidetect browser.

These parameters should not obviously contradict one another. For example, if your browser is using a proxy from one country while some network data points to your real connection in another country, this can create additional inconsistencies.

Key Takeaways

If you use a proxy with an antidetect browser, check both your main IP address and WebRTC.

If WebRTC exposes your real public IP, adjust the WebRTC settings in your antidetect browser. If the browser provides the option, it is better to spoof or mask WebRTC based on your proxy IP rather than simply disable WebRTC entirely.

After changing the settings, always run another WebRTC leak test.

This allows you to verify that your proxy is correctly changing the IP for regular traffic while WebRTC is not exposing your original public IP address.