title: Getting PERMISSION DENIED while copying a file from local to remote using SCP
body: <p>I am trying to copy a file from local machine to remote machine using <code>scp</code> using the following command:    </p>
  
  <pre><code>scp user@xx.xx.xx.xx:/home/user/Testing.txt user@mm.mm.mm.mm:~/ 
  </code></pre>
  
  <p>and I ended up with following error: </p>
  
  <pre><code>Address xx.xx.xx.xx maps to ec2-xx-xx-xx-xx.yyyy.yyyy.yyyyy.com, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!Permission denied (publickey,gssapi-keyex,gssapi-with-mic).
  </code></pre>
  
  <p>Guide me with this error.</p>