DNS Leak

A DNS leak happens when your web traffic travels through a proxy or VPN tunnel, but your device still asks your local internet provider (ISP) to look up the website's address. To understand what is a dns leak, imagine whispering a private message inside a soundproof tube, but shouting the recipient's name across the room before speaking. The content may be routed through the proxy, but your local DNS request openly reveals your real location and identity.

In automated data extraction, a dns leak proxy misconfiguration silently sabotages scraping operations. If your scraper uses a proxy located in New York, but your local machine resolves domain names through an ISP resolver in London, anti-bot firewalls easily spot the geographic mismatch and block the connection. Running a dns leak test reveals whether your scraper exposes your origin network during initial domain lookups.

To fix dns leak issues in your scraping scripts, you must ensure all domain lookups are resolved remotely by the proxy server itself rather than your local system. As outlined in the guide on how to use a SOCKS5 proxy server, developers solve this by setting DNS to proxy mode or using socks5h:// in connection strings. Using MrScraper Residential Proxies eliminates these configuration headaches by resolving hostnames on the proxy side automatically.