Configuring OCSP stapling in NGINX

Question

Should I concatenate all certificates(server + intermediates + root) or just(server + intermediates) for ssl_trusted_certificate directive in NGINX.

Answer 1

You should add the following setting

ssl_stapling on;
ssl_stapling_verify on;
ssl_trusted_certificate /path/to/root_CA_cert_plus_intermediates;

to configure OCSP Stapling (the server certificate should not be concatenated here), but you should use ssl_certificate, where the server certificate is provided together with all intermediate certificates:

ssl_certificate /path/to/signed_cert_plus_intermediates;

On the other side one should don't include the root_CA_cert here.