title: FCM Handshake Exception from a network
body: <p>I am trying to access <a href="https://fcm.googleapis.com/fcm/send" rel="nofollow noreferrer">https://fcm.googleapis.com/fcm/send</a> from a Web Application in Java. The problem is I receive the following exception while trying to access it:</p>
  
  <pre><code>javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  </code></pre>
  
  <p>This happens only when I try to access it from a specific network (eg. Work). From other networks (eg. Home), I do not see this issue. </p>
  
  <p>What type of changes would I need to do (in the network) so as to I would be able to access the url from the Work Network too.</p>