Ok i did reset the Pre Auth URL to "nothing", but nothing changed.
After i did check the config of the DHCP on the COMPLAN Interface i found out that i did set custom DNS Servers (DNS) for this HotSpot, turns out that was my problem…
After i set all back to nothing it works just fine, so i'm just a bit stupid :D
Tank you for this Hint, Problem solved.
Greetings Chris-The-Tuner