Our proxy receives HTTP 403 on authentication requests


We have a nginx proxy forwarding to auth0. Since yesterday the forwarded calls receive HTTP 403 by Cloudflare. If I request on the server of the nginx proxy an authentication token directly using curl, then the call succeeds.

Does anyone have a idea why the proxy calls are suddenly blocked? The proxy was working for several months.


Hey there!

Can you send me your tenant name over private message? Thank you!

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Thanks for you response.

We just found out what caused the issue. In the request made by the proxy to auth0.com the HTTP header Host contained an invalid value. This causes only a problem since yesterday.

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Gotchya! Thanks for sharing it!