Hi Jensen,
Looks like the gateway (.54) replied to your openhab server that port 9898 was unreachable. Perhaps it is not open? I’m wondering if you are having the same problem as me down the bottom of this forum post. I’m currently trying to get to the bottom of this.
Can you use nmap to check if the port is responding? Also; can you run tcpdump to check if you see multicast packets being sent on 244.0.0.50?
Aaron