A 407 status code, indicating authentication failure, could result from the following scenarios:
- You have an inactive or expired plan.
- You're using an unmetered traffic plan without having whitelisted a source IP address.
- Traffic is originating from an unauthorized IP.
- You're relying on an outdated proxy list.
How to Resolve?
Double-check your credentials. Ensure you possess an active plan and that you're implementing the correct, updated proxy list.
For those on a metered plan that doesn't necessitate whitelisting specific source IPs, consider leaving the IP authorization page blank. This offers flexibility, especially if you often switch between different servers, PCs, or use third-party captcha solvers. It eliminates the need for extensive IP authorizations. However, this approach is recommended solely for metered plans that don't mandate IP authorization.