In MongoDB 3.2 I've setup a user with rights:

db.createUser(
  {
    user: "username",
    pwd: "pass",
    roles: [ { role: "readWrite", db: "dbname" }]

     }
)

db.auth("username", "pass" )

When I use the JMeter(2.13) to connect to the database (using Jmeter's elements MongoDB Source Config , MongoDB Script) and run a query like this:

db.mycollectionname.find()

I get this error:

error: { "$err" : "not authorized on dbname to execute command { $eval: \"db.mycollectionname.find()\", args: [] }" , "code" : 13}

While I have provided all the necessary details Server Address List , Database , User , Password to Jmeter's MongoDB Source Config , MongoDB Script respectively.

Any ideas what can be happening?