How to let Jenkins listen to port 80?

With the default configuration, Jenkins is listening to port 8080: $ ss -tulpn | grep 8080 tcp LISTEN 0 50 *:8080 *:* users:(("java",pid=3052,fd=115) However, I want to change that and have Jenkins listen to port 80. When I go into /etc/sysconfig/jenkins and change JENKINS_PORT to JENKINS_PORT="80" and restart sudo service jenkins restart, I get: $ ss -tulpn | grep 8080 $ ss -tulpn | grep 80 $ curl localhost:8080 curl: (7) Failed to connect to localhost port 8080 after 0 ms: Connection refused $ curl localhost:80 curl: (7) Failed to connect to localhost port 80 after 0 ms: Connection refused How can I let Jenkins listen to port 80?