DL3:PRIMARY> use RIAProduction
switched to db RIAProduction
DL3:PRIMARY> show users
{
	"_id" : "RIAProduction.RIAUser",
	"user" : "RIAUser",
	"db" : "RIAProduction",
	"roles" : [
		{
			"role" : "dbAdmin",
			"db" : "RIAProduction"
		},
		{
			"role" : "dbOwner",
			"db" : "RIAProduction"
		},
		{
			"role" : "read",
			"db" : "RIAProduction"
		},
		{
			"role" : "readWrite",
			"db" : "RIAProduction"
		}
	]
}
DL3:PRIMARY> db.changeUserPassword("RIAUser", "newpassword")
DL3:PRIMARY>

mongo --host 10.238.4.32:27000 -u RIAUser -p newpassword --authenticationDatabase RIAProduction
MongoDB shell version: 3.0.0
connecting to: 10.238.4.32:27000/test
2016-03-30T08:29:42.545-0700 E QUERY    Error: 18 Authentication failed.
    at DB._authOrThrow (src/mongo/shell/db.js:1236:32)
    at (auth):6:8
    at (auth):7:2 at src/mongo/shell/db.js:1236
exception: login failed