Linux Firewall

Did you know RHEL has a firewall? I didn’t.

Here is how you can stop the feature: sudo /etc/init.d/iptables stop
http://www.cyberciti.biz/faq/turn-on-turn-off-firewall-in-linux/

A Linux firewall is software based firewall that provides protection between your server (workstation) and damaging content on the Internet or network. It will try to guard your computer against both malicious users and software such as viruses/worms.

https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Security_Guide/sect-Security_Guide-IPTables.html