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Stack trace

java.io.IOException: Could not find JSON in http://links.sonatype.com/products/insight/ci/jenkins-plugins?id=insight-ci&version=2.7.3
	at hudson.model.DownloadService.loadJSON(DownloadService.java:174)
	at hudson.model.UpdateSite.updateDirectlyNow(UpdateSite.java:176)
	at hudson.PluginManager.doCheckUpdatesServer(PluginManager.java:1615)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:324)
	at org.kohsuke.stapler.interceptor.RequirePOST$Processor.invoke(RequirePOST.java:52)