java.lang.IllegalArgumentException: protocol = http host = null
        at sun.net.spi.DefaultProxySelector.select(DefaultProxySelector.java:146)
        at org.netbeans.core.NbProxySelector.select(NbProxySelector.java:123)
        at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:724)
        at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:654)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:977)
        at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:2052)
        at org.netbeans.modules.hudson.ui.wizard.InstancePropertiesPanel$1.run(InstancePropertiesPanel.java:133)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:573)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1005)