What is a DNS Leak?

A DNS leak occurs when your device sends DNS resolution queries outside the proxy tunnel, revealing the websites you visit to your ISP or local DNS resolver despite using a proxy. This compromises the privacy that the proxy is intended to provide.

How DNS Queries Escape the Proxy Tunnel

When you use a proxy, ideally all traffic including DNS queries should route through the proxy. A DNS leak happens when the operating system or browser resolves domain names using the default DNS server (usually provided by your ISP) instead of routing DNS through the proxy tunnel. This can occur due to misconfigured proxy settings, WebRTC protocols, IPv6 fallback, or smart multi-homed name resolution features in modern operating systems.

For example, you configure your browser to use gate.hexproxies.com:8080 for all traffic. The browser correctly sends HTTP requests through the proxy, but your OS resolves example.com via your ISP's DNS server before the request is proxied. Your ISP now knows you visited example.com even though the web traffic itself went through Hex Proxies.

Preventing DNS Leaks

DNS leaks silently undermine proxy privacy. Even with elite proxy anonymity, a DNS leak reveals your browsing activity to your ISP and potentially exposes your real location to target websites. Hex Proxies recommends configuring proxy-level DNS resolution and regularly testing for DNS leaks to ensure complete privacy coverage.