title: fsockopen on SSL does not working on specific host
body: <p>On working production server, at some point (June 24 at 13:18), fsockopen started to fail with no seen reason.</p>
  
  <pre><code>$sock = fsockopen("ssl://mail.dupcheck.org",993, $errno, $errstr, 300);
  </code></pre>
  
  <ul>
  <li>it returns: $sock = false, errno = 0, errstr = "" quite fast.</li>
  <li>it opens other servers.</li>
  </ul>
  
  <p>Important to mention,</p>
  
  <ul>
  <li>it does not work both, on linux web server and on windows (WAMP) development server</li>
  <li>MS Outlook and other mail clients perfectly connect to this server and fetch the mail.</li>
  <li>that day (June 24) we had some issues with GoDaddy SSL certificate - it started to show improper date! We called GoDaddy's support then and they say,  the issue is fixed.</li>
  <li>Since then, for almost a month, SOMETIMES fsockopen worked and we received emails, and nobody paid attention, nobody checked that specific mailsend log ... until today it reached 300M!</li>
  </ul>
  
  <p>====</p>
  
  <p>PHP 7.3.3-1, ubuntu16.04.1</p>
  
  <hr>
  
  <p>Yes, I read manuals, googled for several hours, no relief. Nobody knows what's that, including system administrators.</p>