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Using a proxy but still getting DNS leaks? Turns out 90% of people haven't turned on this setting
Charles
2026-03-31 03:50
Recently, many people have encountered this situation: even though a proxy is enabled and the IP shows an overseas location, some platforms can still accurately detect the real location and even trigger risk control directly.
The real issue often lies in a small detail that many overlook: DNS leaks. By the time account anomalies or access restrictions occur and you start troubleshooting, it's already too late.
Today, let’s walk through what DNS leaks are, why they happen, how to test for DNS leaks, and how to completely solve the problem step by step.
1. What is a DNS leak? Why does it still happen even with a proxy?
If you are using a proxy but your DNS requests are not routed through it and instead go directly through your local network, your real IP, ISP, and even your actual location can still be exposed — this is called a DNS leak.
👉 Simply put: you think your traffic is going through a proxy, but your DNS requests are “running naked.” It’s like wearing a mask but revealing your identity the moment you speak.
2. Common causes of DNS leaks (many people fall into these traps)
Many users take precautions but still experience DNS leaks. The usual reasons include:
1. DNS leak protection is not enabled
Many proxy tools do not force DNS through the proxy by default and require manual activation.
2. Using system default DNS
For example, ISP DNS (like telecom providers), which are most likely to expose real information.
3. Browser bypasses the proxy
Some browsers (especially Chromium-based ones) use “predictive resolution” and send DNS requests directly.
4. IPv6 is not disabled
Some proxies only support IPv4, while IPv6 requests go out directly, causing leaks. This is why many people say: “I’m using a proxy, so why am I still detected?”
3. How to perform a DNS leak test? (Highly recommended)
It’s actually quite simple to check whether a DNS leak exists. You can run a quick DNS leak test.
• Open an online DNS leak test website (https://www.todetect.net/)
• After testing, it will display your current DNS server location.
△ If you see: DNS location = your real country/city → a DNS leak has occurred.
△ If it shows: DNS location = proxy node location → everything is normal.
4. Not just DNS: Browser fingerprints can also expose you
Many people fix DNS leaks but overlook another hidden issue — browser fingerprinting. Websites can identify you through:
• Browser type
• Operating system
• Screen resolution
• Fonts and plugins
• WebGL and Canvas fingerprints
Even if you change your IP, websites may still recognize you.
In this case, you can use the ToDetect fingerprint checking tool to analyze your browser’s exposure level and see whether you are uniquely identifiable.
5. Common scenarios vs DNS leak risk comparison
| Scenario | DNS Leak Probability | Typical Behavior | Risk Level | Recommended Solution |
|---|---|---|---|---|
| Browser proxy extension only | Very High | IP changes but DNS remains local ISP | 🔴 High | Use system-level proxy + enable DNS leak protection |
| VPN without DNS protection | High | DNS shows real location | 🔴 High | Enable DNS Leak Protection |
| Split tunneling (rule-based mode) | Medium | Some sites normal, others exposed | 🟠 Medium | Switch to global proxy or refine rules |
| Public WiFi + proxy | Very High | DNS hijacked or tampered | 🔴 High | Force DoH + encrypted DNS |
| IPv6 enabled without support | High | Abnormal IP appears in DNS test | 🔴 High | Disable IPv6 or use IPv6-supported proxy |
| Secure DNS without proxy routing | Medium | DNS shows third-party but not proxy location | 🟠 Medium | Use together with proxy |
| Global proxy + DoH | Low | DNS matches proxy location | 🟢 Low | Recommended long-term setup |
| Proxy + fingerprint browser | Very Low | DNS and browser environment fully aligned | 🟢 Very Low | Ideal for high-privacy needs |
6. How to completely prevent DNS leaks (practical guide)
1. Enable DNS protection in your proxy tool
Key options: “Prevent DNS Leak” or “DNS over Proxy”. This is the most critical step — 90% of users simply forget to enable it.
2. Use secure DNS (DoH / DoT)
Recommended: Cloudflare DNS (1.1.1.1), Google DNS (8.8.8.8).
Or enable DNS over HTTPS (DoH) to encrypt DNS requests.
3. Disable browser predictive resolution
For Chrome: turn off “Use a prediction service to load pages” to prevent DNS requests from bypassing the proxy.
4. Disable IPv6 (very important)
Especially on Windows and routers — many DNS leaks are caused by IPv6.
5. Use global proxy mode
Avoid rule-based or split tunneling modes, as some traffic may bypass the proxy.
6. Regular DNS + fingerprint checks
It’s recommended to test DNS leaks and check browser fingerprints using ToDetect every time you switch nodes.
7. Advanced DNS leak protection tips
If you are involved in cross-border business, e-commerce, or multi-account operations, these tips can further improve security:
• Use isolated browsers (e.g., fingerprint browsers)
• One account per isolated environment
• Combine proxy + fingerprint management tools
• Regularly clear cache and cookies
👉 Because modern platforms rely heavily on browser fingerprinting, changing IP alone is no longer enough.
Summary
Many people spend time choosing nodes and switching IPs, but overlook DNS settings and browser environments. The result is that everything looks “secure,” but in reality, they have already been fully identified.
If you want a cleaner and more stable network environment, remember one simple rule: not only hide your IP, but also hide your “resolution path” and “device characteristics.”
It is recommended to regularly use the ToDetect fingerprint checking tool to review your browser fingerprint. Don’t wait until issues arise — proactive DNS leak testing and environment checks will save you the most time.
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