Kazoo doesn't see MinimServer when using 2 network adapters on the same subnet

[eseb63]

hello,
i would like to test minimserver features, so i installed it on a synology NAS but i encounter some issues to use with some control points/renderers (on Windows 10).

for the moment, i use foobar2000 as upnp renderer (with old foo_upnp plugin).

for the control points, i tried :
- dbPowerAmp "Asset Control" : it recognizes MinimServer and plays on Foobar
- Linn Kinsky : MinimServer is found and a room is created with Foobar

these products are quite old, sometimes abandonned, so i tried the more recent Linn Kazoo, but it didn't work :
issue 1 : no room
issue 2 : MinimServer is not found

issue 1 : i read that kazoo needs openhome compliant renderer ; i installed BubbleUpnp Server and created an openhome renderer for Foobar ; but Kazoo doesn't recognize it ... (it is well seen by Kinsky)

issue 2 : i installed minimWatch to see if it would find MinimServer : it didn't either (the icon is greyed).

i restarted PC, NAS, software, disabled the firewall : nothing changed.

i endly disabled the 4G Box, and it solved the issue 2 : Kazoo and MinimWatch find MinimServer on the NAS (the issue 1 remains).
If enabled again, MinimServer is not found anymore.

i have two network adapters on my PC :
- one is connected to an ADSL box which handles the local network (DHCP active)
- another is connected to a 4G box, to boost internet because the ADSL box is very slow (DHCP inactive)
- the two boxes are on the same subnet : 192.168.1.0
- a setting in windows gives priority to the 4G box connection.

MinimWatch log:
MinimWatch 2.2 update 116, Copyright © 2012-2024 Simon Nash. All rights reserved.
Java™ SE Runtime Environment (build 1.8.0_441-b07)
Java HotSpot™ 64-Bit Server VM (build 25.441-b07, mixed mode)
Platform default charset is windows-1252
System platform is windows-x64
UPnP port 9791 has been selected
Single subnet 192.168.1.0 has been selected
Startup complete

any idea
- to make Minimserver found while using 4g connection?
- to make Kazoo recognize Foobar room ?

thanks in advance for the reply