FRITZ!BOX HIDDEN DEBUG FEATURES

• http://192.168.178.1/support.lua contains some options to generate debug information, especially the following.
• http://192.168.178.1/html/capture.html will enable to capture the traffic on every interface of the box. For old devices (old as in 5140) you do not even need authentication.
• http://192.168.178.1/jason_boxinfo.xml reveals (among others) the serial number, which you need to open a support ticket.