OK Thanks.... it worked....

Looks like you are getting error as below - The unit jenkins.service has entered the 'failed' state with result 'protocol'.

Check Jenkins Version-

[root@ip-172-31-91-250 jenkins]# jenkins --version

Sep 12, 2022 2:51:41 AM executable.Main verifyJavaVersion

SEVERE: Running with Java class version 52, which is older than the Minimum required version 55. See https://jenkins.io/redirect/java-support/

java.lang.UnsupportedClassVersionError: 52.0

at executable.Main.verifyJavaVersion(Main.java:145)

at executable.Main.main(Main.java:109)

Jenkins requires Java versions [17, 11] but you are running with Java 1.8 from /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.342.b07-2.el8_6.x86_64/jre

java.lang.UnsupportedClassVersionError: 52.0

at executable.Main.verifyJavaVersion(Main.java:145)

at executable.Main.main(Main.java:109)

[root@ip-172-31-91-250 jenkins]#

Solution- Jenkins New version cannot be installed with java 8 ( As per certification Matrix - https://www.jenkins.io/doc/book/installing/linux/). Install Java 11 to Install Jenkins

New version cannot be installed with java 8 ( As per certification Matrix - https://www.jenkins.io/doc/book/installing/linux/). Install Java 11 to Install Jenkins

jenkins.io