RatOs Configurator repository invalid

I am at a point where I need a little hint to solve my problem. I installed 2.1 rc2 and updated all sections in the update manager where an update was possible directly or with soft recovery. I did no hard recovery yet. The RatOS configurator repository is still invalid. The connection is good. During my first attempt I did a hard recovery what ended up with the 502 bad gateway error. What can I do to get this running? I didn't change the config yet. Only wifi is setup.