@woozle Sry for the late response, I wasn't on my PC until today and after looking at your ipconfig and compared it with mine, I found the solution ... or at least it is working now. On the PC I can...

@woozle Thank you for the fast response. I tried rebooting the main router before the reset of the Extender, but while the main router still had internet access, I couldn't get any signal from the...

Around two years ago I set up my WR840N as a Range Extender and everything worked without problems. For some reason, I didn't have a connection to the internet in the last days, which was the reason...