title: nmap warning: giving up on port because retransmission cap hit (2)
body: <p>I am trying to scan a large set of domain names using nmap. I used the following command:</p>
  
  <pre><code>Nmap -PN -p443 -sS -T5 -oX out.xml -iL in.csv
  </code></pre>
  
  <p>I get the following warning:</p>
  
  <pre><code>Warning: xx.xx.xx.xx giving up on port because retransmission cap hit (2).
  </code></pre>
  
  <p>Why does this happen? How to resolve the issue ?</p>