I've also tried to register, which also didn't work.

static.88-198-24-38.clients.your-server.de (88.198.24.38) just sends SYN/ACK while my box tries to connect port 10444 and thats it... after a while I got "104, 'Connection reset by peer'".

I am not using NAT, the box where I try to install Open-E lite is directly connected to the Internet with own official IP.