Try switching your VPN protocol to NordWhisper (availability may vary by device):
Settings → Protocol → NordWhisper
If the issue persists, reset your network settings on your device (iOS, Android, Mac, Windows, or Linux). This can clear old VPN or network configurations that may be blocking the connection.
For any account, login, device, connection, or technical VPN issues, please contact NordVPN Support for further assistance.