I still don't know how to get the connection working.
I'm using windows client v1.2.0.0-unk-beta. The one from the official site.
Can someone help please with this issue?
Try the latest version of Windows wallet:
https://mega.co.nz/#!3kpUBToJ!Yqihr5gTsqImMZ2V7fYQkNnhIDElHbvAk5P0kS5eyKk