the GW is working good but this error message been popped up inside qubes taskbar (down the screen). also with yellow mark beside the GW in the state.
ignore it or no ? if no , is there a way to fix it ? if no , is it dangerous ?
i think but not sure it is in the category of the “ignore” because from what i have seen inside whonix wiki that whonix doesnt interfere with mac address of the host?! (or maybe the situation here is different i dont know …)
In short: you’ve probably shut down GW while there were connected AppVMs. Such operation isn’t currently handled properly (the issue linked above). The only thing you can do now, is to shut down those VMs and start them again.