Lieber Stefan,
My WDP Kumpel Dieter G., had a serious problem with a Märklin CS2- Sotware vesion 3.8.1 (11) and WDP. When both units were activated we were informed by WDP that "Ports 15730 und 15731 ist NICHT erlaubt".
Once again, to cut a long story short,
I loaded CS2 software 3.7.0, corrected the I.P. incompatibility problem and all now works. As far as I can see, the problem is with Märklin CS2 software version 3.8.1. (11), as seen on two different systems (?). I have not found any reference to this problem on the NET, so it will be interesting to hear if any other WDP users have heard or even experienced the same problem ?
Gruß-David.