I’ve re-installed my home-assistant setup which was already on version 0.77.3.
I tried logging in to HA and saw in logs:
2018-09-15 10:57:51 WARNING (MainThread) [homeassistant.components.http.ban] Login attempt or request with invalid authentication from <my ip>
2018-09-15 10:57:51 INFO (MainThread) [homeassistant.core] Bus:Handling <Event call_service[L]: domain=persistent_notification, service=create, service_data=notification_id=http-login, title=Login attempt failed, message=Login attempt or request with invalid authentication from <my ip>>
I followed the reset authentication instructions and deleted the relevant files from .storage dir.
In the following startup I was indeed asked to fill user & pass but no matter what I do, the same WARNING message appears in logs and the browser stuck on “Loading data” screen.