I'm a little unclear of your network topology.
Zones can appear through DLNA or because you're connected to a Library Server.
You can control both behaviors in Options > Media Network. Turn off 'DLNA Controller' on the client or 'DLNA Renderer' on the server to disable the DLNA part.
My original question had two parts. One related to an MC Library Server with an MC Client on a localnet. How to keep all the zones of the server from appearing on the client. I see now that it can be done but only by settings on the client, in its media options.
The second part was how to keep all server zones from showing up on Gizmo.
I don't have any active DLNA clients, but DLNA (Generic) is enabled on just the server for other devices to be discovered.
I'd really like to see a little more flexibility in the authentication to a MC Library server. Having only one authentication ID assumes that any device connecting remotely (whether it be another MC, a browser, or other application) all have the same purpose and can display the same options.
Would it be suggestible to allow x number of different authentications, in which each one can be set for a different level of access and display? Especially with the browser client access methods, but not just those. In some peoples' hands all options are 'safe', but in others it could be disastrous to the Library server. I certainly wouldn't want to give my wife a login which shows remote zones, allows playlist modifications, deletions, etc. Not because of malicious intent, but due to carelessness in operation. I'd want to confine that to local playback and a local list.
It just seems that so much more could be possible for multiple net users of the server (family, friends, etc) but doing that now could potentially cause many problems. I don't know if that's getting outside of the design goal or not. Would be a nice addition to an excellent product, though. I'm still amazed at all MC can do right now. It just seems like a little more refinement in net access control would be quite beneficial.
--Bill