Then you need to open the C2S port (by default `52822`, but check the plugin settings to get the current value) in your firewall so that it can be reached from the internet.If you don't want to use C2S connections for anything else than your Matterbridge service, you should restrict access to this port to your Matterbridge server IP.
In case you are using a port other than `5222` (XMPP standard port) you also need to set the [xmpp-client SRV record](https://prosody.im/doc/dns#srv_records) to the correct port.
