The endpoint paths the client redirect user's to are incorrectly built and a '/' is missing between saml2 and SSO. This causes clients to be redirected to an incorrectly named page and get a 404 error instead of being authenticated.
This issue ticket was originally removed from the tracker as it clashed with the pull request. See upstream ticket for migration details.
Metadata Update from @t0xic0der: - Issue close_status updated to: Fixed - Issue status updated to: Closed (was: Open)