(Origin of reDuhGUI: reDuh was originally part of a topic released by SensePost at the BlackHatUSA2008 conference. Its appearance was used for a problem that Web security penetration testing often faced at that time, and it was also a very important part of Web server reinforcement, that is, the Web server only opened one port 80 to the outside world. The security protection of the web server can be customized for the port of the operating system or the port before the network management fire prevention. At this time, if the penetration tester wants to further test the intranet, he must first take down the solution server and have certain control rights. reDuhGUI is a WindowsGUI version transplanted from the original JAVA language to the C language by Norsay Technology.)