Pesky unknown renderers
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Re: Pesky unknown renderers
What you're saying doesn't make much sense. UMS isn't "secure" in any way, it doesn't control access (except for the primitive IP filter and "code" functionality). You should make sure that WAN addresses can't reach UMS, for example by using NAT. There is no need to do any portforwarding to use UMS, and you should not do so.
The discovery protocol (SSDP) used by UPnP/DLNA and thus UMS doesn't implement any kind of authentication or other "security" feature, but it requires multicast to work. Internet routers don't forward multicast packets, so UMS shouldn't be discoverable outside your LAN even if you have no firewall or NAT in your router. Neither does it support IPv6, which would have made all this much more tricky.
So, to sum it up: I very much doubt that UMS "finds" devices from your WAN. If it does, it's because multicast routing somehow has been configured both on your router and on the remote location, in a way that lets them exchange multicast packets. This simply doesn't happen by accident, so unless you have specifically done so we can exclude that as a possibility.
Whatever the source is of the "unknown renderers" you see, they doesn't come from the Internet. Chances that a bug in UMS shows stuff that's not actually there, or that your LAN has devices you're not aware of, are much greater.
You'd need to post debug files and give a precise description of your network topology for anyone to be able to help you figure it out.
The discovery protocol (SSDP) used by UPnP/DLNA and thus UMS doesn't implement any kind of authentication or other "security" feature, but it requires multicast to work. Internet routers don't forward multicast packets, so UMS shouldn't be discoverable outside your LAN even if you have no firewall or NAT in your router. Neither does it support IPv6, which would have made all this much more tricky.
So, to sum it up: I very much doubt that UMS "finds" devices from your WAN. If it does, it's because multicast routing somehow has been configured both on your router and on the remote location, in a way that lets them exchange multicast packets. This simply doesn't happen by accident, so unless you have specifically done so we can exclude that as a possibility.
Whatever the source is of the "unknown renderers" you see, they doesn't come from the Internet. Chances that a bug in UMS shows stuff that's not actually there, or that your LAN has devices you're not aware of, are much greater.
You'd need to post debug files and give a precise description of your network topology for anyone to be able to help you figure it out.