...story continues:
As with the latest update (from etherpad 4.1.0 to 4.1.1.), I can't login via '/admin-auth' as mentioned earlier. Instead, I get this error:
RPError: outgoing request timed out after 3500ms
at /run/etherpad-lite/src/plugin_packages/.versions/openid-client@5.7.0/lib/helpers/request.js:140:13
at async Client.grant (/run/etherpad-lite/src/plugin_packages/.versions/openid-client@5.7.0/lib/client.js:1370:22)
at async Client.callback (/run/etherpad-lite/src/plugin_packages/.versions/openid-client@5.7.0/lib/client.js:520:24)
at async /run/etherpad-lite/src/plugin_packages/.versions/ep_openid_connect@3.0.7/index.js:144:11
The pad itself runs as usual.