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A web application firewall is a firewall program, registration of visitors, production and application or service. Jobs in monitoring and if necessary to prevent the input, output or the system requires a service that does not comply with the policies of firewall configuration. The web application firewall program is usually designed for one or more programs or services (such as a database or a web organizer), as opposed to tasteful web control can only go to almost all types of network traffic. There are two types of web application security firewalls, application firewalls and network-based firewalls, host-based application. Network Firewall application layer firewall works at the level of protocol stack implementation dunes, and the server is a firewall or a proxy on the basis of known reverse proxy. application firewalls, network traffic is explicitly name of the service as a firewall, you have the right to use the Internet. To implement programs host or a piece of network hardware. Often it is a machine with different proxy servers proxy for traffic before the client or server. How application level, you can access the contents of the traffic content sites to avoid viruses, companies exploitation known bug in the logic of client software. firewall, network-based application is the level of implementation of the network stack (for example, any browser Telnet, FTP traffic) and can be played on all packages to the dunes or application. Basically, a firewall to block all traffic, but likely not protected computer. Firewalls can also use advanced encryption to servers Corridor Office approved Application Block uninvited guests / output or incorrect information or determine whether the use! Authentication management policies that prevent transmission.