Web servers are often the target of various security attacks. Some attacks are so severe that corporate assets, productivity, and customer relationships often suffer heavy losses. In fact, all attacks cause people a lot of inconvenience and distress. Ensure that the Web server is secure Security is key to business success. URLScan is an ISAPI filter that enables Web site administrators to limit the types of HTTP requests that the server will handle. By blocking specific HTTP requests, the URLScan filter prevents potentially harmful requests from reaching the server and cause damage.