Application firewalls address the application layer by enforcing requests within application sessions accessed through the Internet. An application firewall specifically protects the Web application communication stream and all associated application resources from attacks that use a Web protocol.
Application firewalls address browser and HTTP attacks that attempt manipulate application behavior for malicious purposes. These include data attacks, which use special characters, wild cards or known application vulnerabilities to change data; logic content attacks, which go after command strings or logic statements; and target attacks, that focus on accounts, files or hosts.
Application firewalls are used in addition to traditional firewalls that address network access and are an important defense for an organizations critical applications.
"Since the first day we installed Kerio MailServer we knew it was a winner. All you have to do is spend a few minutes watching those virus-laden emails hit the email engine and you have a real feeling of security and confidence. Since we installed Kerio MailServer, viruses have become a thing of the past. With new features addressing SPAM we have seen a dramatic drop in the number of spammers bothering our users. One thing we really like is, Kerio is a company large enough to provide us with world-class software while remaining focused on providing personal support. I like the fact that I’m a person at Kerio, not just another license number"
Gary Delius, Director of Information Systems