The site currently encountered heavy problems with web hosting performance, which affected both the site and indicators authentication.
I temporarily switched off the indicators authentication, to enable the site pages. The disabled authentication does not have direct impact on indicators, they work as usually, but you cannot see your name in the usual place. You can rather see this site URL (ovo.cz). By this step I released the jam on web pages.
I identified the problem, and I expect it will work again tonight as usually.
Apologies to all for inconvenience.