Failing Git and Github plugin and its dependency installation in Jenkins

Question

I was trying to install GitHub plugin, but am getting status as failed with error,

java.net.SocketTimeoutException: Read timed out
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.socketRead(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at java.io.BufferedInputStream.read1(Unknown Source)
    at java.io.BufferedInputStream.read(Unknown Source)
    at sun.net.www.MeteredStream.read(Unknown Source)
    at java.io.FilterInputStream.read(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(Unknown Source)
    at org.apache.commons.io.input.ProxyInputStream.read(ProxyInputStream.java:77)
    at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1139)
Caused: java.io.IOException: Failed to load http://updates.jenkins-ci.org/download/plugins/git/3.9.1/git.hpi to C:\Program Files (x86)\Jenkins\plugins\git.jpi.tmp
    at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1144)
Caused: java.io.IOException: Failed to download from http://updates.jenkins-ci.org/download/plugins/git/3.9.1/git.hpi (redirected to: http://ftp-nyc.osuosl.org/pub/jenkins/plugins/git/3.9.1/git.hpi)
    at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1178)
    at hudson.model.UpdateCenter$DownloadJob._run(UpdateCenter.java:1715)
    at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1978)
    at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1689)
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:112)
    at java.lang.Thread.run(Unknown Source)

I have a working internet connection, but couldn't able to fix the issue.

Answer 1

The issue looks similar to this bug mentioned under the Jenkins Issue. The status shows that this bug is fixed but unreleased.

Check in the comments at the bottom of the page and you can find that it is caused by firewall.