title: Webhook execution failed: execution expired
body: <p>I am trying to trigger jenkins build whenever there is a push to GitLab.<br>
  I am referring to <a href="https://github.com/jenkinsci/gitlab-plugin" rel="nofollow noreferrer">https://github.com/jenkinsci/gitlab-plugin</a>.</p>
  
  <p>When I test the connection for webhook it shows <code>execution expired</code>.</p>
  
  <p>I am using:</p>
  
  <ul>
  <li>Jenkins ver. 2.60.1</li>
  <li>GitLab version 9.4.0-rc2-ee </li>
  <li>Git lab  plugin 1.4.6</li>
  </ul>