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Using netbeans behind a proxy which uses username/pwd authorization doesn't work. There isn't even a possibility to enter username/pwd in the proxy dialogue (options -> general) and no additional dialogue pops up (like e.g. when using Webstart behind the same proxy) where one could enter a username and a password. Due to this issue connecting to the update center or to nbextras is not possible.
Created attachment 29162 [details] The log-file showing java.net.ConnectionExceptions
Reassignig to openide for evaluation, I hope it is the right component.
This is a request for new functionality, not supported yet. Should be tracked as ENHANCEMENT but I left as DEFECT for consideration which release should be addressed this problem.
*** This issue has been marked as a duplicate of 75053 ***