title: Error checking out license: System clock has been set back
body: <p>On Azure CentOS VM while starting a custom application server that rely on FLEXnet license, I got the following error:</p>
  
  <pre><code>Error checking out license: System clock has been set back.
  Feature:       ep_u
  License path:  /opt/MyApplication/license/MyApplication-license.dat:
  FLEXnet Licensing error:-88,309
  For further information, refer to the FLEXnet Licensing documentation,
  available at "www.flexerasoftware.com".
  </code></pre>
  
  <p>After searching on the net, I found that this error is due to some system file modified in the future.</p>