Naim App no longer picking up Minim server

[gianluca]

I have Sequoia 15.3.2, MinimServer 2.2 update 258, MinimStreamer 2.0.13. I have made some tests.
Minim is running on my Mac, which is attached to a tp-link router. When I connect my iPhone to the wifi of the tp-link, VLC can see and play with MinimStreamer, irrespective whether Little Snitch is active or not.

The tp-link is connected by ethernet to a VodafoneStation. The Naim is itself attached to VodafoneStation by Ethernet.
When I connect by iPhone to the VodafoneStation wifi, it cannot see MinimStreamer. I suppose Naim cannot either.

The question seems to be how to funnel MinimStreamer beyond tp-link up to VodafoneStation. Have anybody any idea?

I looked at the gp-link and Vodafone Station setup but I could not detect anything seemingly relevant. I am very incompetent with modems.