We cannot upload ANY plugin to Jenkins. I tried NodesJS, GitHub, JIRA.

My netops open the firewall to test but I got the same errors, so it is not a firewall.  Please advice! 

Here is the errors:

Failure -java.io.FileNotFoundException: http://updates.jenkins-ci.org/download/plugins/nodejs/1.2.7/nodejs.hpi 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 hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1125) Caused: java.io.FileNotFoundException: http://updates.jenkins-ci.org/download/plugins/nodejs/1.2.7/nodejs.hpi 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$10.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1141) Caused: java.io.IOException: Failed to load http://updates.jenkins-ci.org/download/plugins/nodejs/1.2.7/nodejs.hpi to C:\Program Files (x86)\Jenkins\plugins\nodejs.jpi.tmp at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1148) Caused: java.io.IOException: Failed to download from http://updates.jenkins-ci.org/download/plugins/nodejs/1.2.7/nodejs.hpi at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1182) at hudson.model.UpdateCenter$DownloadJob._run(UpdateCenter.java:1719) at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1982) at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1693) at java.util.concurrent.Executors$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)