MongoDB with Authentication - mongodb

Question

I am trying to get MongoDB running on my localhost (Windows) with authentication.
To do so, I first have to add a user, right?
I did so by starting the daemon using this command:
C:\[…]\mongod.exe -f C:\[…]\mongo.config
mongo.config contains the following:
# Basic database configuration
dbpath = C:\[…]\db\
bind_ip = 127.0.0.1
port = 20571
# Security
noauth = true
# Administration & Monitoring
nohttpinterface = true
After that I connected via this command:
C:\[…]\mongo.exe --port 20571 127.0.0.1
There I added a user:
> use admin
switched to db admin
> db.addUser('test', 'test')
{ "n" : 0, "connectionId" : 1, "err" : null, "ok" : 1 }
{
"user" : "test",
"readOnly" : false,
"pwd" : "a6de521abefc2fed4f5876855a3484f5",
"_id" : ObjectId("50db155e157524b3d2195278")
}
To check if everything worked I did the following:
> db.system.users.find()
{ "_id" : ObjectId("50db155e157524b3d2195278"), "user" : "test", "readOnly" : false, "pwd" : "a6de521abefc2fed4f5876855a3484f5" }
Which seemed OK to me.
After that I changed "noauth = true" to "auth = true" in the mongo.config file and restarted the daemon.
Now I expected to be able to connect with user and password:
C:\[…]\mongo.exe --port 20571 -u test -p test 127.0.0.1
Which denied access to me with this message:
MongoDB shell version: 2.0.4
connecting to: 127.0.0.1:20571/127.0.0.1
Wed Dec 26 16:24:36 uncaught exception: error { "$err" : "bad or malformed command request?", "code" : 13530 }
exception: login failed
So here's my question: Why does the login fail?
I can still connect without providing user and password, but can't access any data because "unauthorized db:admin lock type:-1 client:127.0.0.1". Which is actually what I expected.

Answer 1

As Andrei Sfat told me in the comments on the question I made 2 major errors.
First, I thought I could pass the IP to the Client as a simple argument. But you have to use --host for that.
Instead, the parameter I thought was the IP address actually should be the db name.
So the correct command to connect to a Server is as follows:
C:\[…]\mongo.exe --port 20571 -u test -p test --host 127.0.0.1 admin
Second, users are per database. As I only added the user "test" to the db "admin", it only works there.

Answer 2

Obviously the auth = true configuration wasn't load successfully. Did you forget the -f paramter when you restart the mongod.exe?
C:\[…]\mongod.exe -f C:\[…]\mongo.config