Dear All,

We keep getting the following error when upgrading mongo gem from 2.4.3 to 2.5.3 and 2.6.2.
Rolling back the driver to 2.4.3 worked without problem.

Mongo::Auth::Unauthorized: User ... is not authorized to access ...

The errors seem to occur intermittently.

We are using Mongoid with the following options:

• database
• hosts
• options
  • user:
  • password:
  • auth_mech:
  • read:
    • mode:
  • replica_set:
  • connect: :replicaset

The supported mechanisms in our MongoDB are "MONGODB-CR", "MONGODB-X509", and "SCRAM-SHA-1"

Any help would be greatly appreciated.
Thank you.