Please pardon my response in English- but it is my native tongue; my German is quite poor, having only a few months of learning in school many, many years ago 
The problem is that this VNC instance is really poorly written. Every keypress/etc is literally AJAXified through so it causes a full request/response, which is somewhat strange in implementation, causing very poor bounce detection. It would be nice if NetCup would allow a user to connect to their service with their own choice of VNC product- because Guac VNC is incredibly poor- even when I RDP'd into a nearby-neighbor at Hetz just to try to set a password with less aggravation.
The rest of SCP seems to be well-written for most users; I had to do virtually nothing to figure how things were laid out and designed. It truly is a shame about Guac-VNC.
