According to the sourceforge notice, the access methods for project web file management have changed. The new accepted methods are: SFTP, SCP, rsync over SSH. SSH shell service is not supported anymore.
When maven 2 SSH based wagon deploy site, it zip the whole site, upload zip file and unzip it with remote SSH call, which wouldn't work after SHELL service is stopped. Which means SSH wagon is broken for all projects hosted in sourceforge.
Issue has been raised but not resolved. Until this issue is resolved, all site deployment to sourceforge hosted project remains broken.