tomcat8 listen port 443

sudo vi /etc/default/tomcat8

AUTHBIND=yes

sudo touch /etc/authbind/byport/443
sudo chown tomcat8 /etc/authbind/byport/443
sudo chmod 500 /etc/authbind/byport/443

edit /var/lib/tomcat8/conf/server.xml set from 8443 to 443