SBCL’s code is hosted on SourceForge, for reasons that might be accurately summarized as historical. The occasional downtime aside, it has generally worked.
This weekend SourceForge “upgraded” (for which read “changed”) SBCL’s hosting to its new Allura implementation of its hosting infrastructure. In the process, the git repositories have changed their location. I hope that all people with commit access know where the new writeable location is; read-only access is from git://git.code.sf.net/p/sbcl/sbcl or http://git.code.sf.net/p/sbcl/sbcl. Please update your remotes.