The default authorization mechanism in mongodb changed to SCRAM-SHA-1. User should be warned in the documentation, that he needs to compile mongo-cxx-driver with --ssl option when using default authorization in the c++ code.
Cannot contribute to wiki due to known Github limitations (http://stackoverflow.com/questions/10642928/how-to-pull-request-a-wiki-page-on-github)
Made a wiki fork with changes:
https://github.com/imitrichev/mongo-cxx-driver-wiki