Use a password?

[ArenMook]

1. TNServerInstance.Start(5127, serverUdpPort, lobby.remotePort, "server.dat", TNServerInstance.Type.Udp))

You're creating a server with a save file, meaning whatever persistent actions you take on it will be saved. If at any point you've created a channel with a persistent flag, that channel will always be there with whatever password you chose. You need to delete the server.dat file to clear it.

Access denied sounds exactly like it does -- can't access the file, so yes saving won't work. Conflicting results there. Either things get saved, or not.

As for the label, keep in mind that when you JoinChannel passing a scene name, it will load that scene upon joining -- so whatever you had in the original scene won't be there anymore, including the UI.

[Shifty Geezer]

How do I create a server without requiring a log file? All the parameter options including a lobby port also require a filename. I tried putting in a null string and Android reports 'access to "/world.dat" is denied.' If I have to remove the log file manual, how do I do that?

As for the UI label, I'm not loading a scene. The scene is unchanging but the label or game object goes 'missing'.

[Shifty Geezer]

Additionally, none of my join commands are persistent, so none of my channels should be being saved anyway, as I understand it.

[ArenMook]

If none of your join commands are persistent, then nothing will be getting saved aside from the basic header, and whatever you set as TNManager.SetServerData.

Scene is unchanging -- how's that? Your JoinChannel passes a scene to load. It doesn't matter if you're in the same scene. It should reload a clean copy. If you want the scene to not change, pass null instead.

[Shifty Geezer]

Turns out the problem was a typo, using Disable() instead of OnDisable() so the callbacks weren't being cleared.