I can't open file manager

I’m facing an issue with the file manager, the page shows this error

I read the thread (FTP troubleshooting ) but it seems like directed for users that have troubles with credentials and password but for me I can’t even open the page. how can i solve it, please?

Try using VPN or over mobile data.
See if above helps you open file manager.

it works, thanks! It is strange that it was working normally several months ago

Seems your ISP has blocked that url, ask them to unblock it for you.