Web applications are being adopted by businesses of all sized and branches of industry. Sharepoint, Office 365, SAP portals and many other applications simplify business processes between colleagues and with suppliers and customers. At the same time, however, web applications are also potential targets for hackers. USP Secure Entry Server® is a web application firewall, protecting all the web applications in a business. Thanks to its versatile authentication functions, it can permit controlled use of the applications by external parties. At the same time it makes colleagues' work easier by using single sign-on.