The request was aborted: Could not create SSL/TLS secure channel BUT works with Fiddler

I'm trying to send a send a webrequest to the url "https://boligsurf.dk". However I keep getting the following error:

The request was aborted: Could not create SSL/TLS secure channel.

The strange thing is that when I try again with FIDDLER running the request works fine.

Does anyone know what could be the reason this exception is being thrown? I have looked at similar issues but couldn't find any solutions to my issue. Feel free to try the URL on your own and see if you get the error too!