What is Proxy Authentication?

Proxy authentication is the process of verifying a user's identity before granting access to a proxy server. The most common methods include username/password credentials sent with each request and IP-based whitelisting where the user's source IP serves as the authentication factor.

Credential and Whitelist Authentication Flows

In credential-based authentication, the client includes a Proxy-Authorization header with Base64-encoded credentials in each request. For HTTP proxies, this uses the 407 Proxy Authentication Required challenge-response flow. SOCKS5 proxies handle authentication during the initial handshake phase with the username/password sub-negotiation. The proxy server validates the credentials against its user database before allowing the connection to proceed to the target.

With Hex Proxies, you authenticate to gate.hexproxies.com:8080 using either method. Credential auth embeds your username:password in each request. Whitelist auth skips credentials entirely once your server IP is registered. Both methods grant the same pool access.

Security and Billing Implications

Proper authentication prevents unauthorized usage of proxy resources and ensures billing accuracy. It also enables per-user access controls, usage tracking, and rate limiting. Hex Proxies supports both credential-based and IP whitelist authentication, with per-session credential generation for maximum security.