MinimWatch can't find MinimServer on Synology NAS

[hsimon46]

Okay, this is getting completely crazy-making.

Here's what's happening:

1. I have disabled both the 2.4 and 5.0 networks and everything is operating solely on the home network called "hsimon46."
2. The Airport Extreme shows that IGMP Snooping is disabled.
3. When the NAS, the Esoteric and a PC all are hard-wired to the network (the first two directly to the modem and the PC to the 8-port switch connected to the modem), I can control the Esoteric with Kinsky on the PC and everything works fine (though Kinsky crashes if I disconnect the PC from the hard-wire and try to go wireless.). BUT, in that configuration, the iPad (connected wirelessly to the network) sees *neither* the player nor the library in either SoundStream or Kinsky.
4. However, when I connect the Esoteric to an Airport Express running on the network as an extension of the Airport Extreme, the iPad sees the Esoteric (and can play Tidal), but can't see a library.

What now? Thanks.