Cannot access Apps from Front end

Disable / Enable Linux Firewall (Red hat/CentOS/Fedora Core) :

Symptoms:
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Oracle Apps 11i is running fine in backend but cannot access in the Front end

Reason:
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The Firewall is enabled so we cannot Connect from outside/Front end Browser. SO Disable firewall in the server.

Solution:
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Note :you must login as the root user :

1. /etc/init.d/iptables save
2. /etc/init.d/iptables stop

After this we can use the front end for apps.