title: How to find the replica set name?
body: <p>I have an M0 instance created at mongodb.com using all the defaults. I copied the URI connection string from the Atlas Connection dialog. It was recognized in mongoDB Compass and the connection details form was automatically filled out.</p>
  
  <p>It worked fine for a few weeks and I could browse my documents. Then all of a sudden I am getting:</p>
  
  <blockquote>
    <p>An error occurred while loading navigation: 'not master and slaveOk=false': It is recommended to change your read preference in the connection dialog to Primary Preferred or Secondary Preferred or provide a replica set name for a full topology connection.</p>
  </blockquote>
  
  <p>I searched and most suggest to explicitly specify the <code>Replica Set Name</code>. The automatic settings have <code>Read Preference</code> set to Primary and the <code>Replica Set Name</code> is blank.</p>
  
  <p>Why is this error occurring suddenly, and how do I find out the replica set name to use?</p>