During implementation of the mod_gssapi test module I found that I wasn't getting an WWW-Authenticate header back so had no chance to do negotiation.
AFAICT this boiled down to the order of the modules: mod_auth_gssapi needs to be loaded before mod_auth_mellon.
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: Invalid - Issue status updated to: Closed (was: Open)