I currently have a microsoft application running on tls 1.2 (using a .p12 file if it helps).

I'm configuring an upstream connection, something like this:

upstream example.server.com {
        server example.server.com:5003;
    }

    server{
        listen 11600 ssl;
        proxy_pass example.server.com;
        proxy_ssl_certificate         /etc/nginx/ssl/ServerCertificateAndIntermediateCert.crt;
        proxy_ssl_certificate_key     /etc/nginx/ssl/wdtvs.key;
        proxy_ssl_session_reuse       on;

I've been unable to make this work. And cannot connect to the microsoft application from the proxy. Am reading the nginx documentation on upstream configurations. But maybe I'm not understanding something basic. Any help is appreciated.