Database tool hangs getting a connection

Whenever I try to connect to a database using the database plugin, it just hangs. No error, no timeout, it just keeps trying forever. I see this when trying to execute a query or clicking the "Test Connection" button in the "Project Data Sources" dialog.

When I check the log file, it looks like it makes a call to com.intellij.database.remote.RemoteJdbcServer and nothing gets logged after. I have written a command line java program to connect to the database with the same jdbc drivers and it works just fine.

I've tried deleting and reinstalling Intellij on my account and even on a new user account and it still hangs.

This worked fine for months and it suddenly stopped while I was in the middle of working yesterday. I didn't install anything new or update my machine. I was literally running queries every couple of minutes and suddenly they just stopped returning. Reboots, reinstalls, new users, nothing seems to work.

I'm running arch linux with kde and plasma 5.