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[nerddude]

I have a jriver mc server running on windows 10.I am using 6 pi3 running volumio as renderers.
JRiver only sees few of the volumio devices but windows sees them all. Also after somtime jriver server stops showing in remote.
Any ideas what i should try?

[RoderickGI]

It is an ongoing mystery to me why MC sees some Renderers, and not other, sometimes, and not others. I have never found a concise or reliable way to work out why or how to fix it. There is lots of discussion about Volumio and seeing DLNA Renderers of the forum though.

Not being on the same subnet, or even the same switch, is a common issue to investigate.
Having IP Addresses assigned by a different DHCP Server/Router to the Renderers, even if the subnet is the same, could be an issue. Use one DHCP Server, and use Reserved IP Addresses for all your devices, Server and Renderers. That doesn't mean Static IP Addresses. It means using "IP Address Reservation" which might be called "Static Leases" in your router.
Trying a "Refresh Dynamic Zones" might fix the issue. Right-click Playing Now.

Start watching "Services & Plug-ins > Media Network" found in the left Navigation bar.
Filter down to "Device discovery server (SSDP)" and see if all of the Pi3's IP Addresses show up in the listing. They should.
If you filter to the MC Server you should see GET requests from the Pi3's as well, every couple of minutes.

Use AndrewFG's Digital Media Renderer Analyser (DMRA) and see if it can see all the Volumio instances on the Pi3's. http://www.whitebear.ch/dmra
If the DMRA doesn't find any Renderers, check the "Use Windows Discovery" box in the top right corner and try again.

That should give you a starting point.

[nerddude]

Is there a preferred renderer that works without issues?

[JimH]

You could use MC as a DLNA Renderer on any OS we support.

Or you could use MC's Library Server.  On the second machine, load the library from your current server.  Control it with any MC remote. 

The wiki topic on Media Network has links for the above.

[JimH]

RoderickGI's advice to try AndrewFG's DMRA is good advice.

[AndrewFG]

RoderickGI's advice to try AndrewFG's DMRA is good advice.

Yup. Download it from my sig.

[AndrewFG]

It is an ongoing mystery to me why MC sees some Renderers, and not other, sometimes, and not others. I have never found a concise or reliable way to work out why or how to fix it. There is lots of discussion about Volumio and seeing DLNA Renderers of the forum though.

The UPNP spec requires each renderer to have a unique identifier code. I suppose it is possible that a shoddy renderer implementation might not actually generate a truly unique code, but perhaps use something non unique like (a hash of) its model number (or something like that). And in that case MC might conflate two such renderers into one. If that were the case, then it is just possible that MC might be tweaked so it could indeed discern two such renderers by not only looking at their (not) unique codes, but also looking at their IP addresses. Just a thought. => Perhaps bob could give his thoughts on this?