This page tries to list the most frequent problems that can occur during using Ultrasonic, and their solutions. It is a work in progress, and will be updated if our users find something that is worth mentioning here.
If you can't find an answer to your question here, please check the issues, and do not hesitate to create a new issue for it if necessary. We will try to find a solution for you.
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When I'm trying to connect to my server, Ultrasonic displays an Authentication Error ("Login Failed", or "Authentication by token is not supported for LDAP users"). I know my username and password are correct, what now?
In the Server Settings, try to toggle "Force plain password authentication", and test the connection again.
Don't forget to save the server settings after the connection test if everything was OK.
If you would like to know why and how this helps, or just interested in the dark parts of the Subsonic API, read on here.
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Why isn't Ultrasonic visible in Android Auto?
The most probable cause is that you've installed Ultrasonic from F-Droid, or from a Github release.
Android Auto only displays applications installed from the Play Store by default, but luckily this can be changed. Please see this wiki page for details.