java.net.SocketTimeoutException: connect 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 com.squareup.okhttp.internal.Platform.connectSocket(Platform.java:120)
	at com.squareup.okhttp.internal.io.RealConnection.connectSocket(RealConnection.java:141)
	at com.squareup.okhttp.internal.io.RealConnection.connect(RealConnection.java:112)
	at com.squareup.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:184)
	at com.squareup.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:126)
	at com.squareup.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:95)
	at com.squareup.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:281)
	at com.squareup.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:224)
	at com.squareup.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:450)
	at com.squareup.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:399)
	at com.squareup.okhttp.internal.huc.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:527)
	at com.squareup.okhttp.internal.huc.DelegatingHttpsURLConnection.getResponseCode(DelegatingHttpsURLConnection.java:105)
	at com.squareup.okhttp.internal.huc.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:25)
	at org.kohsuke.github.Requester.parse(Requester.java:615)
Caused: org.kohsuke.github.HttpException: Server returned HTTP response code: -1, message: 'null' for URL: https://api.github.com/
	at org.kohsuke.github.Requester.parse(Requester.java:646)
	at org.kohsuke.github.Requester.parse(Requester.java:644)
	at org.kohsuke.github.Requester.parse(Requester.java:644)
	at org.kohsuke.github.Requester.parse(Requester.java:607)
	at org.kohsuke.github.Requester._to(Requester.java:285)
	at org.kohsuke.github.Requester.to(Requester.java:247)
	at org.kohsuke.github.GitHub.checkApiUrlValidity(GitHub.java:744)
	at org.jenkinsci.plugins.github_branch_source.Connector.checkApiUrlValidity(Connector.java:326)
	at org.jenkinsci.plugins.github_branch_source.GitHubSCMSource.checkApiUrlValidity(GitHubSCMSource.java:1518)
Caused: java.io.IOException: It seems https://api.github.com is unreachable
	at org.jenkinsci.plugins.github_branch_source.GitHubSCMSource.checkApiUrlValidity(GitHubSCMSource.java:1521)
	at org.jenkinsci.plugins.github_branch_source.GitHubSCMSource.retrieve(GitHubSCMSource.java:1571)
	at jenkins.scm.api.SCMSource.fetch(SCMSource.java:582)
	at org.jenkinsci.plugins.workflow.multibranch.SCMBinder.create(SCMBinder.java:98)
	at org.jenkinsci.plugins.workflow.job.WorkflowRun.run(WorkflowRun.java:299)
	at hudson.model.ResourceController.execute(ResourceController.java:97)
	at hudson.model.Executor.run(Executor.java:429)
Finished: FAILURE