A password containing special characters, especially the dollar sign, has to be put in single quotes to protect them from the command shell:

$ mongo admin -u uname -p 'password'

Each user is associated with an authentication database. So if your user is declared in admin database (and authorization activated, what MUST be done in all environment server), it's mandatory to add this param in your login command.

See authentication, and more generally security for more details and explanations.

EDIT In case of using Connection String URI Format, you can skip authentication database param, in this case 'admin' will be used by default for authentication database, and 'test' by default as target database.

Example : (your user is created in 'admin' database.)

Here's different behaviors :

authentication against 'admin', database targeted is 'test'

$ mongo --host mongodb://user:pwd@myhost:27000
$ mongo --host mongodb://user:pwd@myhost:27000/test?authSource=admin
$ mongo --host mongodb://user:pwd@myhost:27000/?authSource=admin

authentication against 'admin', database targeted is 'admin'

$ mongo --host mongodb://user:pwd@myhost:27000/admin
$ mongo --host mongodb://user:pwd@myhost:27000/admin?authSource=admin

authentication against 'test', database targeted is 'test' (will not succeed)

$ mongo --host mongodb://user:pwd@myhost:27000/test
$ mongo --host mongodb://user:pwd@myhost:27000/test?authSource=test

EDIT 2 As you really need to use mongo -h -u -p notation, create your user in your 'test' database, which will be used by default in this case :

this will authenticate against 'test' database, and target 'test' database

mongo -h 199.99.99.99:27000 -u user -p pwd

Maybe I'm wrong but the correct form is like this:

mongo --port 27017 -u manager -p 12345678 --authenticationDatabase admin

You can read about this in mongo documentation:

http://docs.mongodb.org/manual/tutorial/add-user-to-database/

mongo --shell

will open the shell interface.

https://docs.mongodb.com/manual/reference/program/mongo/