MongoDB C# 身份验证异常

Question

My database is hosted in mlab.com and I tried to connect it using mongodb C# driver but I am getting following exception when I try to connect to the mlab database.

MongoCommandException: Command 'saslStart' failed: Authentication failed. 
(response: { "ok" : 0.0, "code" : 18, "errmsg" : "Authentication failed." })   
MongoDB.Driver.Operations.CommandOperation_\`1[MongoDB.Driver.CommandResult].Execute (MongoDB.Driver.Internal.MongoConnection connection)
MongoDB.Driver.Communication.Security.SaslAuthenticationProtocol.RunCommand (MongoDB.Driver.Internal.MongoConnection connection, System.String databaseName, IMongoCommand command) 
MongoDB.Driver.Communication.Security.SaslAuthenticationProtocol.Authenticate (MongoDB.Driver.Internal.MongoConnection connection, MongoDB.Driver.MongoCredential credential)
Rethrow as MongoSecurityException: Error: 18 - Authentication failed.

MongoDB.Driver.Communication.Security.SaslAuthenticationProtocol.Authenticate (MongoDB.Driver.Internal.MongoConnection connection, 
MongoDB.Driver.MongoCredential credential) 
MongoDB.Driver.Communication.Security.Authenticator.Authenticate (MongoDB.Driver.MongoCredential credential) 
MongoDB.Driver.Communication.Security.Authenticator.Authenticate () 
MongoDB.Driver.Internal.MongoConnection.Open () 
MongoDB.Driver.Internal.MongoConnection.GetNetworkStream () 
MongoDB.Driver.Internal.MongoConnection.SendMessage (MongoDB.Bson.IO.BsonBuffer buffer, Int32 requestId)
Rethrow as MongoConnectionException:
Unable to connect to server dsXXXXXX.mlab.com:XXXXX: Error: 18 - Authentication failed.. 

MongoDB.Driver.Internal.DirectMongoServerProxy.Connect (TimeSpan timeout, MongoDB.Driver.ReadPreference readPreference)
MongoDB.Driver.MongoServer.Connect (TimeSpan timeout) MongoDB.Driver.MongoServer.Connect ()

Below is the line which throws the error.

client = new MongoClient (new MongoUrl("mongodb://:@dsxxxxx.mlab.com:xxxxx/mydb"));

And the db user has admin rights as well...username and password are also correct..Need some help :-)

Answer 1

I use

var connStr = "mongodb://[username]:[password]@dsxxxx.mongolab.com:xxxx/[dbname]"
IMongoClient client = new MongoClient(connStr);

Notice mongolab.com instead of mlab.com, i just logged into mlab and the suggested connection string uses mongolab.com for me, so double check yours. You should see them as soon as you log into mlab and select your database.

Note that the connection string will be different if you are connecting to a replicaset

Answer 2

Thanks, followed pieperu's advice. Set up another set of credential for the DB (you can find beside Collections tab). Appending those newly set credentials to connStr works.