Jenkins jobs are not visible on dashboard even jobs folders are present in Jenkins installation

Login to http://vda1cs8571:8080/. Click on Release or Snapshot To Online Test tabs, No jobs are getting displayed. But jobs folders are presnt in Jenkins installation

Below is the error stack trace when tried to upgrade Jenkins plugins related to Jenkins jobs.

java.io.IOException: Unable to tunnel through proxy. Proxy returns “HTTP/1.1 404 Not Found”

at sun.net.www.protocol.http.HttpURLConnection.doTunneling(Unknown Source)

at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source)

at java.net.URLConnection.getHeaderFieldLong(Unknown Source)

at java.net.URLConnection.getContentLengthLong(Unknown Source)

at java.net.URLConnection.getContentLength(Unknown Source)

at sun.net.www.protocol.https.HttpsURLConnectionImpl.getContentLength(Unknown Source)

at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1121)

Caused: java.io.IOException: Unable to tunnel through proxy. Proxy returns “HTTP/1.1 404 Not Found”

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

at java.lang.reflect.Constructor.newInstance(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)

at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)

at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1137)

Caused: java.io.IOException: Failed to load https://updates.jenkins.io/download/plugins/external-monitor-job/215.v2e88e894db_f8/external-monitor-job.hpi to T:\Jenkins\plugins\external-monitor-job.jpi.tmp

at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1144

You need to provide more details. Your jenkins in an internal URL so nobody is able to access it.

java.io.IOException: Unable to tunnel through proxy. Proxy returns “HTTP/1.1 404 Not Found”

at sun.net.www.protocol.http.HttpURLConnection.doTunneling(Unknown Source)

at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source)

at java.net.URLConnection.getHeaderFieldLong(Unknown Source)

at java.net.URLConnection.getContentLengthLong(Unknown Source)

at java.net.URLConnection.getContentLength(Unknown Source)

at sun.net.www.protocol.https.HttpsURLConnectionImpl.getContentLength(Unknown Source)

at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1121)

Caused: java.io.IOException: Unable to tunnel through proxy. Proxy returns “HTTP/1.1 404 Not Found”

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

at java.lang.reflect.Constructor.newInstance(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)

at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)

at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1137)

Caused: java.io.IOException: Failed to load https://updates.jenkins.io/download/plugins/external-monitor-job/215.v2e88e894db_f8/external-monitor-job.hpi to T:\Jenkins\plugins\external-monitor-job.jpi.tmp

at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1144)

Caused: java.io.IOException: Failed to download from https://updates.jenkins.io/download/plugins/external-monitor-job/215.v2e88e894db_f8/external-monitor-job.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)