Description:
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When attempting to connect to an IP address (not a domain) over SSL using cURL (7.9.5), there is no response, no errors, etc.  I get nothing.  When I test the same script with a domain (a different server), I get a response as expected.  When I test it with the correct IP address over HTTP (non-secure), I also get a response as expected.

The problem, however, is that the server that I have to connect to for the app I'm building does not have a domain, only an IP address and it must be a secure connection.  

I admit that I could be missing something, but I can't figure out what it is and I've tested it pretty thoroughly under multiple scenarios.

Reproduce code:
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$postdata = "POST DATA TO POST TO SERVER";

// use appropriate IP, of course
$ch = curl_init("https://xxx.xxx.xxx.xxx"); 
curl_setopt($ch, CURL_POST, 1);
curl_setopt($ch, CURL_POSTFIELDS, $postdata);
curl_setopt($ch, CURL_ERROR, 1);
curl_setopt($ch, CURL_RETURNTRANSFER, 1);
$retval = curl_exec($ch);
curl_close($ch);

// print result for testing
echo $retval;
exit;


Expected result:
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The echo statement should print the web page data from the IP to the screen, and it does when I test with non-secure IP or domain.

Actual result:
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Nothing. The echo statement doesn't seem to print anything.  No cURL errors, no results, no PHP warnings or errors.