The plugin comes with an AppImage that is used to run the [Prosody XMPP server](https://prosody.im).If this AppImage is not working, you can fallback to the Prosody that is packaged for your server. Just install the `prosody` package.
If this setting is left empty, and you are using Peertube >= 5.1 or later, the plugin will use values from your Peertube configuration file to guess on which interface and port request have to be done.