> For the complete documentation index, see [llms.txt](https://doc.thordata.com/doc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.thordata.com/doc/faq/product-problem/residential-proxies/how-do-i-authenticate-the-proxies.md).

# How do I authenticate the proxies?

Two methods are supported: username/password authentication and whitelisted IPs. Username/password works well for scripts and account-based control; whitelisted IPs are useful for fixed server environments.