Yatse WIFI host no connection

Hi,
I use Kodi 17.3 with Yatse and I can only connect Yatse with my PC if it is connected via lan. If I try to connect the host PC with wifi I am not able to connect it with Yatse (I know the port of Kodi for lan and wlan is different). I have a powerline adapter 1220 and a Fritzbox 6360 in use. I already contacted the yatse support, but they can not help me.

Thanks for hints.

Regards,
Chrissy