I am trying start Jenkins with jenkins.service system service and accessing jenkins through http page on 8080 port.

When we run system service I could jenkinis is running.But not accessible through browser.

● jenkins.service - LSB: Jenkins Automation Server
Loaded: loaded (/etc/rc.d/init.d/jenkins; generated)
Active: active (running) since Sun 2021-03-14 12:49:32 GMT; 7min ago
Docs: man:systemd-sysv-generator(8)
Process: 506279 ExecStart=/etc/rc.d/init.d/jenkins start (code=exited, status=0/SUCCESS)
Tasks: 1 (limit: 230350)
Memory: 71.2M
CPU: 1.759s
CGroup: /system.slice/jenkins.service
└─506338 /etc/alternatives/java -Djava.awt.headless=true -DJENKINS_HOME=/var/lib/jenkins -jar /usr/lib/jenkins/jenkins.war --logfile=/var/log/jenkins/jenkins.log --webroot=/var/cache/jenkins/war>

Mar 14 12:49:31 localhost systemd[1]: Starting LSB: Jenkins Automation Server...
Mar 14 12:49:31 localhost runuser[506285]: pam_unix(runuser:session): session opened for user root by (uid=0)
Mar 14 12:49:31 localhost runuser[506285]: pam_unix(runuser:session): session closed for user root
Mar 14 12:49:32 localhost jenkins[506279]: [30B blob data]
Mar 14 12:49:32 localhost systemd[1]: Started LSB: Jenkins Automation Server.

Is not working

Where as when I try to run manually, I could able to access.

/etc/alternatives/java -Djava.awt.headless=true -DJENKINS_HOME=/var/lib/jenkins -jar /usr/lib/jenkins/jenkins.war --logfile=/var/log/jenkins/jenkins.log --webroot=/var/cache/jenkins/war

is working good.