> ## Documentation Index
> Fetch the complete documentation index at: https://docs.joinmassive.com/llms.txt
> Use this file to discover all available pages before exploring further.

# I'm getting a "CONNECT tunnel failed, response 407" error. How do I fix it?

> I'm getting a "CONNECT tunnel failed, response 407" error. How do I fix it?

This is an authentication error. To resolve:

1. Verify credentials format (username:password)
2. Check for correct port usage
3. Run test command to validate setup
4. If persisting, [contact support](https://forms.fillout.com/t/p8dRqBYs58us) with error details