title: Mongo error: DBClientBase::findN: transport error()
body: <p>I am facing this error continuously. </p>
  
  <pre><code> DBClientBase::findN: transport error()
  </code></pre>
  
  <p>I searched the problem and found that there are so many people who faced this problem but didn't find exact reason of this error. 
  why this error is coming ?</p>