Web Application Firewall WAF

A web application firewall is a filter that sits in front of your website and reads every request before your application sees it. Someone loads a page, sends a form, or tries to log in. The filter looks at that request, compares it with a list of known attack patterns, and then passes it on or blocks it. Most people shorten the name to WAF.

It is good at the loud, common attacks. A visitor typing database commands into your search box. A machine trying ten thousand passwords on your login page in one minute. A comment carrying hidden code that would run inside the next reader's browser. Scanners hunting for an old admin page nobody removed. Almost none of it is aimed at you personally. It is software trying the same few tricks on every address it reaches, and blocking it keeps your logs readable.

What it cannot do is understand your business. A firewall has no idea that an order may only be cancelled by the person who placed it, or that a receptionist should never open the payroll screen. Those requests look perfectly normal. They come from a real account, carry the right fields and arrive in order. The filter lets them through, because there is nothing suspicious in the shape of the request. It is equally blind to a password a member of staff gave away on the phone.

This is why a firewall never replaces fixing the code. It is a good lock on the front door of a house with a window open at the back. Its real value is time. When a fault is announced in software you use, the firewall can be told to block that exact attack the same day, and that holds the line for the two weeks an update takes. Linkysoft treats that as breathing space rather than a repair, and the fix still goes into the next release of the web application itself.

Expect a noisy first month. Every firewall blocks something legitimate at the start, usually a long form, a file upload or a report page. Ask a supplier who tunes those rules, how fast, and whether that sits inside the price. Linkysoft runs a new firewall in watching mode for two weeks before it blocks anything, so the cybersecurity team learns what normal traffic on your site looks like first. A customer who cannot finish an order rarely writes to complain. They just leave.