Unable to access Jenkins from browser on Windows
If you have installed Jenkins on CentOS 7.1, you should add a rule in firewall for port 8080, or at least disable firewalld.
To disable firewalld, you can use these commands:
systemctl stop firewalld
systemctl disable firewalld
After this you should be able to reach Jenkins on port 8080.
Stop Firewall + start tomcat
Find where you have the iptables, then put them down like this:/etc/init.d/iptables stop(might be some different location on your computer)
Then start up the tomcat you'll have a script like this:startup.sh (in my computer the path is /usr/share/apache-tomcat-7.0.56/bin/)