Status (by brong at Wed Aug 8 14:51 UTC)
A bug in our rollout script caused two servers to be partially started, so they were taking requests but were unable to look up authentication details. This caused those servers to reply that usernames/passwords were incorrect.
We have disabled the rollout process while we make sure this can’t happen again in future.
The failing servers have now been fully shut down again, so all logins should be working.