Q:

Can't use mongo based session store

I have a mongoose and connect-mongo module instance in ym app. I am using the connect-mongo module to have a session store persisted in a mongodb database (mongohq) instead of a memory store.
Everytime I try to access my app when the server is launched (facebook auth with everyauth) I get the following: 

500 MongoError: Error: unauthorized db:express-sessions lock type:-1
  client:199.192.242.4

My user name, password are good. 
var conf = {
  db: {
    db: 'express-sessions',
    host: 'staff.mongohq.com',
    port: 10072,  // optional, default: 27017
    username: 'admin', // optional
    password: 'admin', // optional
    collection: 'facebookSessions' // optional, default: sessions
  },
  secret: '076ee61d63aa10a125ea872411e433b9'
};

app.use(express.session({
    secret: conf.secret,
    maxAge: new Date(Date.now() + 3600000),
    store: new MongoStore(conf.db)
  }));

Edit, this seems to be an issue with my mongohq. I modified the collection for an older one and it works.

A:

I was facing a similar error using Heroku and Mongolab.
I resolved it by manually create a new database user with the mongolab web admin.

