The web traffic on port 80 (http on port 80) of the firewall should be allowed from the internet to the web server. Generally, this is done through the rules configuration. It will basically not allow any traffic from the Internet to the webserver since there is a rule of implicit deny on most of the firewall, so go to the rules configuration and add a new rule in this way:
Source- Any
Destination- IP of webserver
Port: 80 (if configured otherwise, than custom port)
Action: Allow
On most networks, the firewall is a single point of failure. When the firewall goes down, inside users are unable to surf the web, the website goes dead to the outside world, and email grinds to a halt. by placing two firewalls in parallel. All traffic passes through the primary firewall; when it fails the backup firewall assumes the identity of the primary firewall, and continues where it left off. Existing connections are preserved, and network traffic continues as if nothing had happened.
Usually software but some hardware firewall devices are produced.
There are several internet security firewalls that could be considered famous. They include Zone Alarm, McAfee Firewall, TinyWall and Comodo Firewall.
Back to back
the person who invented firewalls was David Pensak
Firewall
stateful packet inspection
Single point of failure
Cisco Systems and Techworld offer load balancer firewalls. Coyotepoint offers a free download of a load balancer firewall.
The best free firewall is the one built on to most computers. Better firewalls cost a lot of money. Software that claim to be free and better than built-in firewalls are usually spam or malware.
Download some of the best Firewalls like Comodo Firewall,Avast firewall etc to keep your ps safe from hackers.
Firewalls are not 100% accurate, as newly created viruses can slip through without detection. Usually, though, firewalls will be updated as regularly as possible to block each new kind of virus. A firewall is only as strong as the person who configures it.