How to Fix DNS Leaks: A Complete Hands-on Tutorial from Detection to Full Resolution

Many people think that once they enable a proxy, they are “completely safe.” But as long as DNS leaks exist, your real network activity records can still be exposed.

What makes it worse is that this issue does not directly alert you like a network disconnection. It acts more like an “invisible vulnerability” — everything appears normal on the surface, while your browsing records may already be quietly exposed in the background.

Today, we’ll walk you step by step through the complete process of DNS leak detection, identifying the problem, and fixing DNS leaks. The guide is beginner-friendly and easy to follow for anyone.

1. What Is a DNS Leak? Why Should You Care?

If you enable a proxy or VPN, your DNS requests are supposed to go through an encrypted tunnel. However, if your DNS requests still go through your local ISP, that means a DNS leak has occurred.

Even if your traffic appears to be protected, DNS records may still expose your browsing activity. That’s why many people are still identified by their real location or browsing behavior even after enabling privacy tools.

2. DNS Leak Detection : Verify the Problem Before Fixing It

Before changing any settings, the first step should always be performing a DNS leak test. Here are two commonly used methods.

1. Use an Online Detection Tool

You can use the ToDetect tool for testing. Focus on checking:

• Whether the displayed DNS server belongs to your local ISP

• Whether multiple DNS servers from different countries/regions appear

• Whether DNS changes consistently before and after enabling the proxy

If you see DNS providers belonging to local ISPs, it usually confirms that a DNS leak exists.

2. Use Browser Fingerprint Detection for Additional Checks

Besides DNS leaks, it’s also a good idea to check your browser fingerprint.

In some situations, DNS may not leak, but your browser fingerprint could still expose your real environment. Sometimes both DNS and fingerprint data leak together, creating even greater privacy risks.

Some detection tools (including ToDetect) also provide browser fingerprint testing to determine whether WebRTC leaks your IP address, whether your timezone or language settings are abnormal, and whether your Canvas fingerprint is unique.

3. DNS Leak Types and Risk Level Comparison Table

4. DNS Leak Fixes (Step-by-Step Guide)

Method 1: Force the Use of Secure DNS (Basic)

Manually change your DNS settings in the system. Recommended options:

• 1.1.1.1 (Cloudflare)

• 8.8.8.8 (Google DNS)

Windows setup path: Network Settings → Change Adapter Options → IPv4 → Manually enter DNS. This is the most basic DNS leak fix and is suitable for general users.

Method 2: Enable “DNS Protection” in Your Proxy/VPN

If you use a proxy or VPN, make sure “DNS Leak Protection” is enabled, “Kill Switch” is turned on, and the VPN’s own DNS is being used. Many DNS leaks happen simply because these settings were not fully enabled.

Method 3: Disable WebRTC Leaks (Very Important)

This step is extremely important when fixing browser-related DNS leaks.

In Chrome, you can install a WebRTC control extension or restrict IP exposure in browser settings. Otherwise, your browser may still expose your real network path even if the proxy works properly.

Method 4: Adjust System DNS Priority (Advanced)

You can force DNS policies through command-line settings, such as disabling automatic DNS assignment, locking public DNS, and clearing old DNS caches.

Windows users can run: ipconfig /flushdns to clear the DNS cache before reconnecting to the network.

Method 5: Router-Level Fix (Permanent Solution)

If multiple devices in your home experience DNS leaks, it’s recommended to modify your router settings directly: Log into the router admin panel → Change WAN DNS → Disable automatic ISP DNS assignment. This is one of the most effective long-term solutions.

5. Always Retest After Fixing

Many people stop after applying fixes, but there’s still one critical step left: run another DNS leak test.

Check whether the DNS server has changed to the VPN/public DNS, whether local ISP nodes still appear, and whether the browser fingerprint remains consistent.

It’s recommended to cross-check with multiple tools (for example, ToDetect + DNS Leak Tool) to avoid false results.

6. DNS Leak Detection & Fixing FAQ

1. Why am I still getting DNS leaks after enabling a proxy?

This is very common. Some proxies only encrypt traffic, while DNS requests still go through the local ISP. Check whether “DNS Protection” or “Prevent DNS Leak” features are enabled, then rerun a DNS leak test.

2. DNS leak tests look normal, so why is my real location still detected?

The issue may not be DNS-related. Browser fingerprinting could still reveal your real environment, including timezone, language settings, or WebRTC IP data. It’s recommended to perform both DNS testing and browser fingerprint testing together.

3. Why do DNS leaks still happen after changing DNS settings?

Common reasons include uncleared system DNS cache, proxy software overriding DNS settings, or the router still assigning ISP DNS servers. Clear the DNS cache → Restart the network → Check router DNS settings.

4. Can smartphones also experience DNS leaks? How can they be fixed?

Yes, especially on Android devices. It’s recommended to use proxies or VPNs that support encrypted global DNS, manually configure DNS in WiFi advanced settings, and regularly perform DNS leak testing.

Conclusion

DNS leaks are not extremely complicated technically, but their hidden nature is what makes them dangerous.

If you’ve followed the methods in this guide to troubleshoot and fix DNS leaks, you can resolve most common issues.

If you want stronger privacy protection, you can also use the ToDetect tool regularly to perform complete network privacy checks and detect both DNS leaks and browser fingerprint leaks together for a more secure setup.