Instantly close VNC and Putty

[FifineHex]

SO: Ubuntu 18.04 / Ubuntu 20.04 (tried both)
Provider: NOCIX
Plan: Dedicated (AMD Quadcore 120SSD + 2TB Preconfigured)
Ram: 16GB

Options: Erase linux SO
What happened:
after successful installation on VNC (restarted and boot into desktop)
I've write "yes" on the part "Had your Windows Server setup completed successfully?" and putty / vnc instantly close and I can't connect again
Also ping on Server IP timeout