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[balky]

My JRMC28 is installed in a docker that has worked flawlessly for ages.

The DLNA server has worked fine and I could see all other DLNA renderers around the house (Marantz NA6006, Volumio... etc.) when I refresh zones on the Android JRemote on my smartphone.

For some unknown reason, since yesterday afternoon, nothing shows up in the available zones anymore.
All was working earlier in the day, I went out to get lunch, and came back and wanted to play music and there was nothing to see anymore, all the zones gone, except for Player and This device (The android tablet)

I thought it might probably be because of the old JRiver version, so I removed MC28 and updated to MC30, but alas, no joy...

I have been using this DLNA thing since I think MC24, so I am not really a newbie...   

There is no firewall in my network at home and none of the renderers run on Windows OS...

Not sure what I really need to be doing... maybe someone has suggestions or ideas.

Thanks.

[Awesome Donkey]

Did you try rebooting everything?

[balky]

Yes, in fact, I wiped and re-installed one of the volumio mini PCs for example, and the Marantz was powered down / up a few times... I was literally in denial that it could be MC28... it has worked flawlessly for years...
But then I realised that all the other devices could not be all broken at exactly the same time, then decided to try another version to see if it will help.

[markf2748]

First determine for certain whether it's a general network issue or if disappearing zones are only associated with JRiver.  For example:

1) Try another Android player app, independent of JRiver, such as "BubbleUPnP for DLNA/Chromecast", and look at its list of detected Renderers and Libraries. 

2) Use an Android network app, such as "Ping & Net", to do a Subnet Scan for a list of visible network devices.

3) Log into your router as administrator and see if the renderers show up as available devices.  Have they always had the same reserved IP addresses (preferred), or are the assigned addresses free to change?

4) Is there a Windows update sitting around somewhere, waiting to be installed?  If so, install it and reboot. (Any updates pending for the docker? the router firmware?)

Re MC Server itself, I am not familiar with Docker installs, but here is what I would check on a normal PC MC Server install:

5) Confirm the Media Center Service is running in the background (a different process than "Media Center xx" which runs the GUI).  It should be visible under Task Manager.  Within MC, look at Org Tree > Services & Plugins > Media Network >  Server & Activity Log.  You should see several different servers running along with their active logs.

6) Do the devices appear in Organization Tree under Playing Now as available zones?  If they don't show up on the server, then most JRiver apps will not see them (Bubble is an exception since it does not depend on MC Server's Playing Now for its network devices info).

7) Are any zones "hidden"?  Org. Tree > Playing Now > RMB Player > Show / Hide Zone > ...