When I try to connect to Mongo instance using this connection string
mongodb://root:password@localhost:27017/
everything works, however, when I try to specify the database name in the connection string
i.e
mongodb://root:password@localhost:27017/storefont
I get the following error MongoDB Connection Error: MongoNetworkError: failed to connect to server [localhost:27017] on first connect [MongoError: Authentication failed.
Specify the authentication database like this:
mongodb://root:password@localhost:27017/storefont?authSource=admin
If you specify a database then this database is also taken for authentication by default. The MongoDB documentation is not 100% clear in that topic.
See also Authentication failure while trying to save to mongodb
The answer provided by Wernfield is correct. I am providing a small tweak along with an example to connect to a replica set:
When using the authSource query param, please ensure that the connection string is wrapped in single quotes OR just use --authenticationDatabase argument instead,
mongo mongodb://ip1:27017,ip2:27017,ip3:27017/my-db --authenticationDatabase admin -u myUsername -p myPassword
