title: SmbException: A duplicate name exists on the network: how to prove that a few servers have the same DNS name
body: <p>Need your advice about the following:</p>
  
  <ul>
  <li>We try to get file from another server in our local network by SMB</li>
  <li>When we call server by IP everything works file</li>
  <li>When we call server by DNS name we get an exception: jcifs.smb.SmbException: A duplicate name exists on the network</li>
  </ul>
  
  <p>I googled the similar questions and found that it could happen when a few servers have the same DNS name.</p>
  
  <p>Could you please advise me how to prove it to our network administrators? Because they say that it’s impossible and every server has the only DNS name in our local network.</p>
  
  <p>Thank you!</p>