after updating to 23.4 and rebooting the appliances I was able to log in but saw nothing except <home>. The problem was that the filr app could not communicate with the search engines. The appliances were up and running, but did not respond to queries. Reason: btrfs did a cleanup of the snapshots. Also the filr app was very busy with this. After btrfs was done on the search and filr apps and I started the filr apps again, everything was working fine. Conclusion, see if btrfs does a cleanup and then be patient.