I'm trying to deploy something on different machines. Some of them use auth for MongoDB, some of them don't and only listen to localhost. Most run MongoDB 2.6.11.

I used to do `mongodb.client.open` first and then `mongodb.client.authenticate` in the callback. When the authentication failed on non-auth databases, the connection would still be open, and I could see this using `mongodb.client._state === 'connected'`.

However, after a long due update to Node-MongoDB 2.0.x, there is no connection if the auth fails. On the same server. Shouldn't this be up to the server to decide?