Roon remote asking for login on connect

I have used Roon remotes from iPad and Windows 8 for a long time, connecting to a Roonserver for a few months. All the same devices.
Suddenly, the iPad asked for a login when I connected. I didn’t do that – I work on cyber security and get suspicious when anybody asks for a password. The Windows remote made the same request. Ok, I did it. After that, the iPad did not ask again.

What is going on?

I had made some minor network changes, but no device or software config changes.

We expire tokens, but having the app running should renew them… you didn’t by chance not have the server on for a few weeks, did you?

Nope, has been on constantly. I have been struggling with getting my network right, daily experimentation, and some listening too.