I have noticed this twice now, the last two week, When I come back into work after the weekend the unit is showing a red flashing light and unreachable through a web browser.
The WebIQ application is still running on the HMI and can be restarted; but I am not able to connect the VPN (from an on screen button).
A reboot resolves the error, the unit is reachable through a browser and the VPN screen control works again.
core is running 1.20