title: tomcat not running on port 80 on aws ec2 instance of ubuntu 16.04LTS
body: <p>I followed following steps to run my web application</p>
  
  <ol>
  <li>I have created an ec2 instance of ubuntu 16.04 LTS on aws. </li>
  <li>Using remote login by ssh, I installed java 8, and then 
  tomcat: sudo apt-get install tomcat7. 
  (tomcat9 could not install using same command)</li>
  <li>I renamed my war file to ROOT(because project name should not be in URL) and copied it to webapps folder. </li>
  <li>After starting tomcat, using <a href="http://IP_address:8080" rel="nofollow noreferrer">http://IP_address:8080</a> I can access my website.
  default setting in server.xml: connector port=”8080” ...
  I checked which services are running
  netstat –plnt
  8005(server shutdown port), 8080(connector port)</li>
  <li>I changes port number from server.xml to 80: connector port=”80” ..
  Then started tomcat.
  I could not access my website.
  also following command doesn't show any service running on port 80.<br>
  netstat –plnt
  8005(server shutdown port)</li>
  </ol>
  
  <p>What changes need to be made so that website will be accessible without entering any port number in URL. (I already mapped domain name to IP address.)
  I want to use java 8 features hence I prefer tomcat 9 installation. </p>