As of 2012-07-31, the SourceForge site has been generally inaccessible from China. We’ve taken some measures to try and restore service, however we’re still seeing connection reset errors in China. If anyone in our community has ideas or suggestions, please notify me via our SourceForge Community Team email address: firstname.lastname@example.org
UPDATE: We are now fully accessible again from China.
Chris Tsai, SourceForge.net Support