If you are working with a Jenkins server you might have faced this problem very often. Still, if you couldn't find a solution to fix this matter read the article till the end and you will find the solution for the problem you had for so long.
We will use the Linux (CentOS Linux - Version 8) for this article and the Jenkins version 2.238
First, open a web browser and type the Jenkins server IP with port 8080 to check whether you can access the Jenkins web interface without any issue. probably you will get an error like this.
Double-check the IP of the server is correct and you have entered the port correctly.
URL Should be like below example
http://192.168.215.3:8080/
Note: The default Jenkins installation runs on ports 8080 and 8443
If the IP Address of the server and the port is all good, then we have to check the problem from the Jenkins server end.
01. Check whether Jenkins is running on the server.
#sudo server jenkins status
If the service is running you can try to restart the service and try again.
02. Check port 8080 is allowed from the firewall
In order to run the Jenkins server, port 8080 should be allowed from the firewall.
Another option is to disable the firewall and check, but this is not recommended in a production environment.
03. Change the Listen address in the Jenkins configuration file.
#sudo vim /etc/sysconfig/jenkins
Go to the JENKINS_LISTEN_ADDRESS in the configuration file, change it to 0.0.0.0 and save exit from the configuration file.
Restart the Jenkins service.
#sudo systemctl restart jenkins
04. Finally, check whether you can access the Jenkins server now.
From the Jenkins server
#curl -v http://localhost:8080
From the remote server
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