Visual Studio can’t attach because connection is refused to: 127.0.0.1:56292.
But the port is free. This is happening randomly. What can I do?
Made it work, here are my steps:
- preferences > external tools > click “regenerate project files”
- restart Unity (that was the important part)
In general make sure debug is set:
- preferences > general > code optimization on startup > debug
Why the restart of Unity was necessary I have no idea
VS just sucks when developing for Unity. Rider rules! 
Seriously I know ALL of these issues and it‘s been like that five years ago! You won‘t look back.
That might be, but I’m not going to enter yet another subscription