Cannot log in because offline archicad

[Zlatka]

When I open my application with educational license it tells me that I am offline and cannot sign in. Network works good and hosts file is empty. What could be the matter? 

Operating system used: Windows 11

[Laszlo Nagy]

If you go to the https://graphisoftid.graphisoft.com/ website, can you log in there and check your EDU license? Can you find it there? Is it still active? (EDU licenses are valid for one year, normally.)