I can no longer login to the WebGUI. The login page loads, when credentials are entered I see it working ("please wait", then "loading please wait"), then it just returns to the login page.
OMV is still functioning and I can access the device through SSH. The credentials must be correct because the system log shows it was authorized and shows no errors:
openmediavault-webgui: Authorized login from ::ffff:192.168.2.8 [username=admin, user-agent=Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:74.0) Gecko/20100101 Firefox/74.0]
The disks/partitions are nowhere near full (df -h). I can't find any errors in logs. The issue persists after rebooting the device through SSH.
This started a few days ago after installing upgrades and rebooting, as I do every few weeks.