Unable to show dbs


I followed this tutorial to setup mongodb , all seems working correctly. However when i put following commands :

> show dbs 
2017-12-20T21:40:26.799+0000 E QUERY    [thread1] Error: listDatabases failed:{
	"ok" : 0,
	"errmsg" : "not authorized on admin to execute command { listDatabases: 1.0 }",
	"code" : 13,
	"codeName" : "Unauthorized"
} :

Someone could say me why?

Thank you


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It looks like you’ve enable user authentication for MongoDB. In fact, that’s the exact error you would expect to receive following Step 3 of the tutorial — Verifying that Unauthenticated Users are Restricted.

If you’ve created users and passwords for Mongo, you will need to connect to it like so:

  1. mongo -u userName -p --authenticationDatabase admin

See the MongoDB documentation to learn more about user authentication.