Hi, I get the same results here.
Chrome and Firefox are able to access the site but curl isn’t.
According to the sslabs test your cert depends on the trust of two intermediate certificates. You’ll need to setup your webserver so it sends them with your certificate.
Comodo (or whoever you brought the SSL cert from) should have a manual on how to do it.
(similar to https://gist.github.com/bradmontgomery/6487319)