Nginx reverse proxy with client certificate (x509) passthrough

[belerofon]

Hi all

I have an IdP with a X509 authentication and this server works finde if I communicate directly:
- browser ask me for a client certificate
- select the x509 client certificate
- browser send certificate-> Done

When I use the Nginx reverse proxy in-between, the browser doesn't ask for my x509 certificate.

In HTTP Server I selected my "Client CA Certificate" and tested all options from "Verify Client Certificate" - but I don't see any differents in action.

any idea?