I changed the JENKINS_PORT="-1" (was JENKINS_PORT="8080" by default) in /etc/sysconfig/jenkins
Enabled 8443 by setting JENKINS_HTTPS_PORT="8443"
Restarted Jenkins using Systemctl. Access to Jenkins on 8080 Still working, while 8443 is not.
OS: Centos 7Java: 8Jenkins: 2.346.3