IP addresses in auth0-forwarded-for header

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I’m logging in with password grant type and send client IP address with all hops it passes in auth0-forwarded-for header. However, I noticed that in the documentation it’s written that there should be a single IP address. My questions are:

  1. Areyou going to change the behaviour?
  2. Is it ok to send several IP addresses in auth0-forwarded-for?
  3. Which of these addresses is used for bruteforce protection?
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Hi @alexei_p,

Welcome to the Auth0 Community and thank you for your post!

Unfortunately you can not send multiple IP addresses in the auth0-forwarded-for header since it is designed only for a single valid IPv6 or IPv4 address, otherwise you will receive a Failed Exchange error.

  • Only the IP address contained in the auth0-forwarded-for header is checked against the brute-force protection and suspicious IP throttling. However you can also add specific client IPs to the AllowLists to be ignored when triggering brute-force protection and suspicious IP throttling.

This is the intended behavior of an authorized header since the client needs to be authenticated within a flow and the auth0-forwarded-for header will only be accepted for authenticated calls with the Client Secret.

I would recommend checking our Avoid Common Issues with Resource Owner Password Flow and Attack Protection documentaton.

Hope this helps.
Best regards,
Remus

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