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In order to log a bug in issuezilla, one needs to be logged in to netbeans.org. The issuezilla integration for the IDE therefore needs to be able to "log in".
Done (finally). It turns out that there is a composite procedure. Hitting the login CGI doens't get you a cookie, but it does get you a bunch of URLs which have a session ID as part of them. Hitting any one of those gets you the cookie, then you are good to go.