Is it posssible to change those WebRTC ports e.g. 50000-50200 to a singel one?

[zionlio]

As the title suggests, my router cannot configure port ranges, and the number of configurable NAT rules is also limited. Is it possible to use only one port for WebRTC UDP forwarding?

[jmattheis]

No. You can probably get away with 20 or so but more are recommended. See #203

[zionlio]

I want to use only one screen sharing, but is it because the software was designed from the start to allow multiple simultaneous sharings that so many ports are needed? Is there a way to limit the software to only one sharing, so that just one port can be used?

[jmattheis]

I want to use only one screen sharing, but is it because the software was designed from the start to allow multiple simultaneous sharings that so many ports are needed?

No, that's how the WebRTC protocol works.

Is there a way to limit the software to only one sharing, so that just one port can be used?

It could work without any WebRTC ports, depending if turn has to used or not. If turn is used, more than one port is needed.