sudo lsof -i -P | grep -i "listen"http://askubuntu.com/questions/259166/change-port-for-desktop-sharing-in-ubuntu-12-10 https://support.realvnc.com/Knowledgebase/Article/View/227/4/how-do-i-find-out-what-port-vnc-server-or-ard-is-listening…