title: OpenSSL: unable to verify the first certificate for Experian URL
body: <p>I am trying to verify an SSL connection to Experian in Ubuntu 10.10 with OpenSSL client. </p>
  
  <pre><code>openssl s_client -CApath /etc/ssl/certs/ -connect dm1.experian.com:443
  </code></pre>
  
  <p>The problem is that the connection closes with a Verify return code: 21 (unable to verify the first certificate).</p>
  
  <p>I've checked the certificate list, and the Certificate used to sign Experian (VeriSign Class 3 Secure Server CA - G3) is included in the list.</p>
  
  <pre><code>/etc/ssl/certs/ca-certificates.crt 
  </code></pre>
  
  <p>Yet I don't know why it is not able to verify the first certificate.
  Thanks in advance.</p>
  
  <p>The entire response could be seen here:
  <a href="https://gist.github.com/1248790" rel="noreferrer">https://gist.github.com/1248790</a></p>