Following up on the comment above regarding IGMP snooping, I recently started seeing a connection problem, not with the Naim app, but this time with Bubbleupnp not seeing my 272 as an available renderer. This only started after I added a D-Link switch. Take away the switch and no issues. Did a bit of research and found this which was in response to similar issues people were seeing with the D-link switch I was using:
- IGMP Snooping is a capability found on some Ethernet Switches (typically “Managed Switches”) that enables it to pass multicast traffic only to those connected client devices (e.g. dCS DAC) who’ve “joined” a multicast group, while filtering out multicast to all other ports.
- Also associated with IGMP Snooping is something called a “Group Membership Interval”, this is a time-limit that an Ethernet Switch will maintain the list of clients who’ve joined to receive multicast packets. Once the timer expires, the Ethernet Switch will filter out multicast to that client/port on the original list unless the client device re-Joins membership to the multicast group.
This can’t be turned off with my switch. I just got around it by unplugging the ethernet cable to the 272 and plugging it back in again. This was on the guess that the switch would forget things if I unplugged the cable :-). I don’t really need the switch, but it is only a few feet away from my listening position, so it’s not a problem for me to do this, and always solves the issue. Don’t know if that problem is in anyway related to yours, but it’s “food for thought”…