The web interface should load and work normally.
The web interface, with no changes made to the pihole system by me, went from working one day to this the next:
This has been running successfully since May. My feeble attempt at improving the situation was to run sudo apt-get update, sudo apt-get dist-upgrade, pihole -up and pihole -r (repair). No joy.
However, the pihole continues to otherwise run properly. I just can’t control it.