Check the status of Monolith
2.1 If it’s alright, try to change (if possible) your Internet provider (stationary/mobile); or Internet connection (cable/wifi);
2.2 If it’s alright, but you can’t change or it doesn’t help, try to reboot router and check, if there is the permission to Internet access for ZClient in Antivirus/Brandmauer!
2.3 You can also login on the website and, not closing the browser, try to connect again.
2.4 If it’s alright, but you can’t change or it doesn’t help, probably you have high ping or your provider blocks you. Try VPN for Windows.