title: Jenkins plugin Manager: Updating plugin data fails
body: <p>When updating the plugin data (<code>http://&lt;jenkins&gt;/pluginManager/checkUpdatesServer</code>) I get this exception:</p>
  
  <pre><code>java.security.cert.CertificateException: No subject alternative DNS name matching 
  updates.jenkins.io found.
      at sun.security.util.HostnameChecker.matchDNS(HostnameChecker.java:214)
      at sun.security.util.HostnameChecker.match(HostnameChecker.java:96)
      at sun.security.ssl.X509TrustManagerImpl.checkIdentity(X509TrustManagerImpl.java:455)
      at sun.security.ssl.X509TrustManagerImpl.checkIdentity(X509TrustManagerImpl.java:436)
      at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:200)
      at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted
      (X509TrustManagerImpl.java:124)
      at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1596)
  Caused: javax.net.ssl.SSLHandshakeException
      at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
      (..)
  </code></pre>
  
  <p>Can somebody explain the issue? Is it an issue with our configuration or with the <code>updates.jenkins.io</code> site? Solutions / workarounds would be great.</p>
  
  <p>Last successful update was 26 days ago.</p>
  
  <p>We run Jenkins with the option </p>
  
  <pre><code>JAVA_ARGS="(..) -Djsse.enableSNIExtension=false"
  </code></pre>
  
  <p>Jenkins is at 2.107.1, but prior 2.89.4 had the same issue.</p>