Hello everyone,
Try again by observing the following points,
1.) “Run as administrator” regedit, even if you are the only user of your Windows system.
When you modify the registry with the “Registry Editor” according to the advice of @nicomarin and that of @JQ89 ([here](https://community.swisscom.ch/t5/Discussions- on-routers/VPN-on-BOX-internet/m-p/409782#M1296 “VPN on BOX internet")) (Thanks to them for these excellent Tutorials!),
- Run it by clicking the right button, then use “Run as administrator”.