I am currently wrestling with a separate issue … having found the ubiquiti router settings it needed an update and so I clicked on that and it seems to be stuck in a loop not doing that 2 hours later Grrr
Oh dear, no update should take that long. I suspect it has hung, you might need to restart it.
Just to double check. You only have one Network (Settings/Network) and one Wifi Network (Settings/WiFi). Correct?
Depending on the layout of your house your phone may be able to “see” more than one of your access points. I would recommend disabling, at least temporarily, your 2.4GHz network (Settings/WiFi/[network name]/WiFi Band) and assigning each AP a unique 5 GHz network channel (Devices/[select each AP in turn]/Settings/Channel).
I see you have a 16-port Unifi switch to which all the APs are connected. Where is that physically? Any reason you have connected the Melco directly to the UDM Pro and not to that Switch?
Once you have things running again can you please check the IP address of your phone (somewhere in Settings depending on if you have iPhone or Android) and the IP address of your Bartók (via the front panel or Mosaic) and report back?
Hmmm - tried restarting and it just started over with the (non) update. Bit worrying
Yes, I have one wifi network
I will get to your other suggestions once the Ubiquiti issue is resolved which is currently driving me nuts!
Thanks so much for all your help
Jumping on a plane now. Fingers crossed it has WiFi. If not I’ll be offline for a couple of hours.
Hmmm, this is from the Ubiquiti support team seven years ago (IGMP Support):
we disabled the IGMP snooping feature (by default) on 5 GHz radios of gen2 models in 3.7.46, and I’m sure this is causing the issues you are seeing… since many people want to do it anyway, we have made it optional… I’ve confirmed, however, that there isn’t a way to enable/disable it from the controller currently (i.e. it doesn’t work as designed), so I’m working on that.
Despite the length of time, for the life of me I can’t find a subsequent reference to the option being fixed, but it looks like it is now turned off by default.
Hi Jeremy, Would be great if you have any ideas on this one.
Regarding IGMP Snooping, I checked my own network while preparing my response to Nick above and I have it enabled on my IoT network (to which all my audio devices are connected) but not on my Main network (to which all my trusted clients connect). I have a routing rule that everything on Main can see everything on IoT but not vice versa.
Although I use Roon by default I did a day of intensive testing with Mosaic and noticed no problems whatsoever.
Thanks Jeremy - yes I found it in the desktop dashboard and it was turned off - for the router at least. Haven’t worked out how to access the settings for the individual WAPs yet.
Click on each of them in the devices screen which opens a new window where you will find the Settings tab on the right.
I could not see any device-level settings for this in the AP settings and according to my understanding that wouldn’t make sense anyway as IGMP is a switching function, not a wireless function.
My understanding is AP’s can send multicast as well as unicast traffic, so I can see why the option for IGMP might be there, but it seems to cause more problems than it solves, so not being able to turn it on is no bad thing!
One thought is to check your UDM isn’t filtering the traffic - it’s worth checking the firewall protection is switched off and then testing again.
When I had a UDM Pro, the firewall created all sorts of random issues where something would stop working until I disabled the firewall.
Just going back to one of your earlier comments about the Bartók not showing on your network map. If it is switched on it should be there, even if it is not connected directly to a UniFi switch.
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Please can you double check that the network view is showing all clients and not just filtering wireless clients (button top left , next to the search box).
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Please check that Multicast DNS is enabled in Global Network Settings.
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Please confirm the IP address of the Bartók and your iPhone as reported by each in its own UI or post a screenshot of your client list for All clients.
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Thank you. I will but I am (for the first time today of all days) having big issues with the router and as a result can’t access the dashboard and for instance the topology. I’m going to have to call an expert in I think, the damn thing is still cycling through trying to do an update but getting nowhere. I looked in the forums and this was a known fault several months ago but was supposedly fixed. Apparently not. So Bartok issues are on the back burner until I can get that sorted. I will be back in touch as soon as I can access that info. Cheers
OK, Good luck. Out of interest which fw version are you stuck on? I remember an issue where a certain fw update required a Java upgrade (which meant that automatic updates failed and had to be performed manually form a PC with the right Java version) but that was ages ago.
Anyway, just documenting where I am for my own benefit so I don’t have to start from zero when we resume:
- I still want to confirm that your client (iPhone) and device (Bartók) are on the same subnet for which I need to see their IP addresses.
- I still want to confirm that Multicast DNS is enabled (Global Network Settings).
- I believe that IGMP Snooping, to the extent it was ever relevant, is a historical bug and not a fundamental factor here, especially given the calibre of your equipment. It can certainly slow down service discovery in certain edge cases (filtering workload on an underpowered switch) but should never prevent it.
- I would like to know exactly which Melco switch you have between the Bartók and the UDM Pro. Afaik Melco switches are L2 only (in which case unlikely to be causing a problem here) but I would like to confirm. If it is an L3 switch it just might be filtering UDP traffic in some way and screwing up the SSDP discovery.
Similarly, for when you return (mostly so I don’t re-write what I’d already written):
If I hit issues, I try to simplify the network by temporarily replacing the switch with a known working non-managed switch to eliminate that from the equation.
If that doesn’t work, I’d plug the music server and dCS into that same switch to test that works and work backwards.
Before you do that, though, it might be worth seeing if rebooting the Melco works, then leaving it a couple of minutes to boot. Some audiophile switches appear to be sensitive to power fluctuations and can crash when that happens. It’s a bit of a longshot, but you have nothing to lose!
PS I agree with @struts001, check Multicast DNS is enabled. The whole system relies on this and this is where many routers fail (mostly ISP provided ones, though).
You have my full sympathy.
I know of lots of people who have had no issues with this router, however I got fed up with it corrupting its configuration every couple of months - meaning it either wouldn’t boot or decide not allow anyone to access the internet. Each time meant a complete config rebuild as I found the backups were corrupted too.
One ended up going back as the error message said something like ‘It’s taking a long time to boot’, which it never recovered from.
I ended up going down the Sophos XG route with an ASUS server and moved the management of the WiFi and switches to a Cloud Key 2. All has worked beautifully for 18 months now 
Apparently, the latest major release is far more reliable, but I have no reason to change back.
Sounds like Nick’s tangling with multiple issues; Mosaic to Bartok “reconnect” occasionally taking 20-seconds is a very different problem to not being able to access Qobuz/Radio services.
In any case, looks like the Unify familiar folk have it on hand 
I was just reading through this again maybe for the 5th time and dug a little deeper. I did find both switches (multicast and igmp) and they were both default in the wrong direction. That has been remedied. Well see if i get any improvements. Thanks again
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Hi Barry,
If you are using Unifi networking products and have posted any threads about problems with Mosaic please point me at them and I’ll take a look. I may have missed them or you may have posted before I joined. I am pretty familiar with Unifi equipment and have a configuration here at home that I can compare with where Mosaic is working without any problems so I am happy to try to help.
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Yep, I agree completely. That said, I suspect he now has a third issue 
Having been there, I feel for Nick and hope he has it resolved quickly (I resorted to factory resetting the device and starting again).
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Hey Struts. Nice of you to offer. Yes. I have UDR and AP’s and switches. I dont stream nearly as much as most and it isnt as troublesome probably for that reason. Rather than try to point to a few posts much easier to say i get “the pause”sometimes when streaming. “Looking for vivaldi or lost connection or whatever”. I play 50 times more discs than stream so its less a problem. I have a ms based nas and qobuz. Until yesterday both of the recommended igmp and multi were in default positions (wrong). I fixed that last night but the snag still occurred. I counted last night was about 5-6 seconds. Not the end of the world but i have a few times rebooted mosaic on iphone to no avail. My recollection I believe is i have switched from iphone x to old ipad which is a foot away and i connect immediately. Sometimes just no response or a delay to the command. Ive also experienced the blurry pause button but it was infrequent maybe a few times. Havent experienced in a few weeks but again listen to many more cds. I think it may be lag due to distance and mesh but im open to trying. I think the distance from UDR to dcs switch is about 100 ft or so. Best. B
Oh yes. I sometimes get interrupted streaming as if “buffer if full” on an old computer. Staggers then plays. Then staggers. May be on same occasion. I have satellite internet so it is also suspect. ( live in boonies)