What to do when the Battle.net Desktop App won't let you stay logged in

The "Log In" button will not light until complete login information is entered.

The Battle.net desktop app is trying to connect to an invalid or nonexistent server.

The Battle.net desktop app is trying to connect to an invalid or nonexistent server.

How to resolve this error when trying to log in to Battle.net

The Battle.net desktop app is unable to find your game installation in the directory selected.

A permissions issue is preventing the Battle.net desktop app from renaming a file during an update.

Can't log into Battle.net website or get online when logging with the Battle.net desktop app.

This error may happen when something interferes with the Battle.net desktop app uninstall process.

Information about Battle.net Desktop App settings and how to toggle Battle.net launch with PC startup