hmm, this looks like a firewall issue maybe. Since even on singleplayer you connection is terminated.
It also could have something to do with the custom skins, which still have some issues. If you have ever used a custom skin, try to reinstall the game (you can transfer your old server-database and blueprints over to keep them).
I did a little troubleshooting on my own. for some reason the server never launched alongside with the client when i hit singleplayer because of another entity of javaw running. a quick tour in task manager solved my issues :D
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