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Plugin Portal http://plugins.netbeans.org/nbpluginportal/updates/6.7/catalog.xml.gz Invalid URL specified for UC, so IDE shows error while updating list of available plugins. In addition different behavior of autoupdate on different platforms brings more troubles. For windows one must use "reload catalog" button to view available plugins while on other platforms this done in background somehow ignorning errors. So XML and SOA plugins are visible immediately after IDE startup on all platforms except windows. On windows one must turn off erroneous UC first then use "Reload catalog". One more -- one invalid URL should not prevent all others to reload.
Plugin portal seems to be down at the moment...
Manual restart of the Plugin Portal solved the problem. Thanks for reporting!
RC3