March 14 Update: Redmine is working again.
There is a bug in the current Debian Redmine package that prevents users from being able to log into the site. I have reported the bug to the package maintainers, but it is uncertain how long it will take them to upload a fixed version. Currently we can view the status of existing bugs and feature requests but not make any changes. Until Redmine is fixed, users may submit bug reports in the comments to this post or by emailing them to me.