Using the Origin Ultimate Bundle properly installed as recommended with Gentool and the patch for ultimate collection and - wich is most likely the problem - a TV-Cable Modem; my ISP is unitymedia, Germany. So i have no possibility to either manipulate any settings or getting a static IP.
Due to the contract beeing rather old i still got IPv4 but thats all the good news.
The modem modell is Arris tm602B 220, i got a TPlink Tp r460 Router hooked to it, serving as lan HUB for laptop and Wlan antenna.
Went into the TP-Router menue, did the portforwarding like in the old days, no change.
Unplugged the Router, connected GamingPC directly to modem, no change.
I even found a way to acess the advanced menue options on the modem (in theory only accessable to ISP service clerks) but it didnt get me any further.
The litle NAT tool you offer for download reports no problems.
Using server nntest.cnc-online.net:30000
Bound to local port 55562
Bound to local alternate port 55563
Resolving hostname 'nntest.cnc-online.net'...
Resolved server host to be '188.8.131.52'
Sending client INIT from port 55562 to nntest.cnc-online.net:30000
Received server INIT 
Our public address is 184.108.40.206:15374
Sending client INIT2  from port 55563 to nntest.cnc-online.net:30000
Received server INIT2 
Our alternate public address is 220.127.116.11:15375
Sending cient START  from port 55563 to nntest.cnc-online.net:30000
Received server START 
Server extra port is 40000
Sending client PING  from port 55562 to nntest.cnc-online.net:40000
Received server PING(1) 
Received server PING(2) 
Received server PING(3) 
Received 3 pings from nntest.cnc-online.net:40000.
NAT negotiation works with your router and connection.
==> You do not have to use port forwarding.
Each and every connection to Players breaks up on the "probe" message. I tried windscribe and SecurityKISS VPN's - didn't help.
I'm about to give up :\