Ca_certificate Issue

Good morning, i am doing SSL on external API from application server, i have succescully configured the cert and key, but when you try to use it from postman it gives the next error;

image

But from the web server the certificate is fully working.

I think the problem is that there is no option to include the ca_cert on external api.

I need some help to find any solution, thanks in advice.

A ca_cert option would only be useful in case the server needs to validate a client-certificate, in which case the server validates that the client-cert is signed by the configured CA cert. For server-certificates this is not needed.