title: Can't Connect to MongoDB Atlas Cluster Using Mongo Shell
body: <p>I set up a cluster on MongoDB Atlas and made myself the admin but I'm having trouble connecting to the Cluster from the shell. On Atlas, I clicked the connect button, clicked connect with Mongo Shell, downloaded the latest Mongo Shell, and copied the command to connect to the cluster:</p>
  
  <pre><code>mongo "mongodb://testcluster-shard-00-00-acqhf.mongodb.net:27017,testcluster-shard-00-01-acqhf.mongodb.net:27017,testcluster-shard-00-02-acqhf.mongodb.net:27017/test?replicaSet=TestCluster-shard-0" --authenticationDatabase admin --ssl --username &lt;USERNAME&gt; --password &lt;PASSWORD&gt;
  </code></pre>
  
  <p>When I run this command I get the stream:</p>
  
  <pre><code>MongoDB shell version v3.4.10
  connecting to: mongodb://testcluster-shard-00-00-
  acqhf.mongodb.net:27017,testcluster-shard-00-01-
  acqhf.mongodb.net:27017,testcluster-shard-00-02-
  acqhf.mongodb.net:27017/test?replicaSet=TestCluster-shard-0
  2017-11-20T11:58:31.883-0500 I NETWORK  [thread1] Starting new replica set monitor for TestCluster-shard-0/testcluster-shard-00-00-
  acqhf.mongodb.net:27017,testcluster-shard-00-01-
  acqhf.mongodb.net:27017,testcluster-shard-00-02-acqhf.mongodb.net:27017
  2017-11-20T11:58:32.119-0500 I NETWORK  [thread1] Successfully connected to testcluster-shard-00-01-acqhf.mongodb.net:27017 (1 connections now open to testcluster-shard-00-01-acqhf.mongodb.net:27017 with a 5 second timeout)
  2017-11-20T11:58:32.131-0500 I NETWORK  [ReplicaSetMonitor-TaskExecutor-0] Successfully connected to testcluster-shard-00-00-acqhf.mongodb.net:27017 (1 connections now open to testcluster-shard-00-00-acqhf.mongodb.net:27017 with a 5 second timeout)
  MongoDB server version: 3.4.10
  2017-11-20T11:58:32.407-0500 I NETWORK  [ReplicaSetMonitor-TaskExecutor-0] Successfully connected to testcluster-shard-00-02-acqhf.mongodb.net:27017 (1 connections now open to testcluster-shard-00-02-acqhf.mongodb.net:27017 with a 5 second timeout)
  2017-11-20T11:58:32.497-0500 I NETWORK  [thread1] Marking host testcluster-shard-00-01-acqhf.mongodb.net:27017 as failed :: caused by :: Location8000: can't authenticate against replica set node testcluster-shard-00-01-acqhf.mongodb.net:27017: bad auth Authentication failed.
  2017-11-20T11:58:32.639-0500 I NETWORK  [thread1] Successfully connected to testcluster-shard-00-02-acqhf.mongodb.net:27017 (1 connections now open to testcluster-shard-00-02-acqhf.mongodb.net:27017 with a 0 second timeout)
  2017-11-20T11:58:32.756-0500 I NETWORK  [thread1] Marking host testcluster-shard-00-02-acqhf.mongodb.net:27017 as failed :: caused by :: Location8000: can't authenticate against replica set node testcluster-shard-00-02-acqhf.mongodb.net:27017: bad auth Authentication failed.
  2017-11-20T11:58:32.899-0500 I NETWORK  [thread1] Successfully connected to testcluster-shard-00-00-acqhf.mongodb.net:27017 (1 connections now open to testcluster-shard-00-00-acqhf.mongodb.net:27017 with a 0 second timeout)
  2017-11-20T11:58:32.995-0500 I NETWORK  [thread1] Marking host testcluster-shard-00-00-acqhf.mongodb.net:27017 as failed :: caused by :: Location8000: can't authenticate against replica set node testcluster-shard-00-00-acqhf.mongodb.net:27017: bad auth Authentication failed.
  2017-11-20T11:58:33.100-0500 I NETWORK  [thread1] Marking host testcluster-shard-00-01-acqhf.mongodb.net:27017 as failed :: caused by :: Location8000: can't authenticate against replica set node testcluster-shard-00-01-acqhf.mongodb.net:27017: bad auth Authentication failed.
  2017-11-20T11:58:33.101-0500 E QUERY    [thread1] Error: can't authenticate against replica set node testcluster-shard-00-01-acqhf.mongodb.net:27017: bad auth Authentication failed. :
  DB.prototype._authOrThrow@src/mongo/shell/db.js:1461:20
  @(auth):6:1
  @(auth):1:2
  exception: login failed
  </code></pre>
  
  <p>I replace the  and  with my username and password but I still can't connect. Do I need to have mongod running in the background? If not what do I need to do to successfully connect? Thank you.</p>