 <p>From the curl manual:</p> <pre><code> -k, --insecure (SSL) This option explicitly allows curl to perform "insecure" SSL connections and transfers. All SSL connections are attempted to be made secure by using the CA certificate bundle installed by default. This makes all connections considered "insecure" fail unless -k, --insecure is used. </code></pre> <p>So running without <code>-k</code> might reveal the problem on curl as well.</p>