SSL working with nginx, not with httpd. Any ideas?

[Ezequiel Garzon]

Greetings! For some reason I'm able to set up SSL support for my domain 
using nginx, but not httpd. I have combined my certificates like this:

    # cat ssl.crt sub.class1.server.ca.pem ca.pem > /etc/ssl/server.crt

However, if I stop nginx and start httpd I get:

    $ curl -I https://ezequiel-garzon.net 
    curl: (60) SSL certificate problem: unable to get local issuer 
certificate

I have attempted to write a minimal config file at /etc/httpd.config:

    server defaults {listen on egress ssl port 443}

Any ideas on what I'm doing wrong? Thanks for your help!

Cheers,

Ezequiel