If you must use free Reflect4 proxies, use SOCKS5 only, and always pair them with HTTPS Everywhere and a VPN kill-switch for safety. And never, ever enter passwords.

: Consider using third-party software that can switch between proxies or automatically find working ones.

When a proxy fails, you’re on your own. There’s no one to contact. You just move to the next IP on the list.

Uses IPs assigned to real home users, making them harder to detect. Deep Security Checklist for Free Proxies