Gnome-network-displays firewall settings

General system Applications
1

I am trying to mirror cast my laptop screen to my TV over WiFi. I do not want to use chromium browsers. I had a look at miraclecast, but as far as I could comprehend it I will not be able to have an internet connection on my laptop, which is a problem for me (and I have no way of going around that with raspberry Pi or other such means). WDS (Miracast Wireless Display Software for Linux OS) says it is discontinued on its GitHub page, so I did not risk trying it.

The only option left (as far as I can tell) is gnome-network-displays. I installed it and it detects my TV, but when I click on it I get:

“A required firewall zone is not available and could not be installed”.

I searched the issue on the Internet, but I couldn’t find much information (that I could comprehend anyway).

There have been 2 topics with no answers to that issue on this forum: here and here.

Can somebody help with me with that or suggest an alternative I have missed.

2

After some attempts to get this working:

  • Added the port 7236 tcp into firewalld on the permanent and runtime profiles on the public zone (and on the P2P-Wifi-Display zone configured by gnome-network-displays). Tried to connect to the tv and it asked for admin permissions (on the background, the app didn’t even wait for the password to be typed and complained about the zone not being available).
  • The other attempt I had was running the app as sudo (not secure but it’s just for tests). Now it didn’t even ask which screen I wanted to share but didn’t complain about the zone once I tried to connect. It kept trying to connect but the TV didn’t display any connection attempts. On the wifi applet I could see the system trying to establish a Wifi P2P connection.

I’m using wayland right now, will test later with X11 to see if this could be gnome-network-displays not handling wayland properly