Hook: org.jenkins.tools.test.hook.MultiParentCompileHook
 Loaded multi-parent compile hook
 Scanned contents of /home/jenkins/workspace/g.jenkins-ci.plugins-plugin-3.49/megawar.war: {"id":"default","core":{"name":"core","version":"2.176.2","url":"https://foobar"},"plugins":{...}}
 Exception in thread "main" java.lang.RuntimeException: Invalid update center url : http://updates.jenkins-ci.org/update-center.json
 	at org.jenkins.tools.test.PluginCompatTester.extractUpdateCenterData(PluginCompatTester.java:583)
 	at org.jenkins.tools.test.PluginCompatTester.testPlugins(PluginCompatTester.java:183)
 	at org.jenkins.tools.test.PluginCompatTesterCli.main(PluginCompatTesterCli.java:164)
 Caused by: java.net.ConnectException: Connection timed out (Connection timed out)
 	at java.net.PlainSocketImpl.socketConnect(Native Method)
 	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
 	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
 	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
 	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
 	at java.net.Socket.connect(Socket.java:589)
 	at java.net.Socket.connect(Socket.java:538)
 	at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
 	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
 	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
 	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
 	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
 	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
 	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1226)
 	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1162)
 	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1056)
 	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:990)
 	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1570)
 	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1498)
 	at java.net.URL.openStream(URL.java:1057)
 	at org.jenkins.tools.test.PluginCompatTester.extractUpdateCenterData(PluginCompatTester.java:581)