Squeezbox cannot connect to LMS

Hi,

i have 3 Squeezebox'es. 2 SB are working fine and can connetct to the LMS Server.
One SB is behind a Wifi Hotspot (Hotspot is a KODI Hotspot). Thisone cannot access to the LMS Server but can connect to mysqueezebox.com. Internet Radio is working fine.
If i connected the SB to the other WLAN, i can connect to my LMS Server.

Can it be a problem that the WLAN from KODI has another IP Range?
The working SB's has the same Network as LMS Server. The SB that cannot connect has another Network.

The security from the LMS Server is not enabled.

Can anybody help?

Regards
Hermann