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if you try to access the update center through a proxy server which requires password authentification (i. e. in an intranet), the update center cannot be reached. there is no possibility to use the update center with this kind of proxy servers.
Sorry, AU relyies on the proxy handling in the JDK, which does not support this feature. The only think we can do is to set the proxy and let URL handlers handle it.
reassigne to Jirka - new owner of autoupdate
Not planned for future releases, closes as WONTFIX.