@george1421 Yes it is. Both, the fog server and the host device, are in VirtualBox - and i get the error message.
But tbh if the problem doesn’t show up when deploying the whole system in my network, i can live with the error occurring in VB.

If it’s true that this only happens in VB and not on the actual network (and then Toms solution works), then this issue is resolved for me.

Figured it out, re running the fog installer after messing with the passwords etc reset my option routers in the dhcpd.conf file.

@tom-elliott THANK YOU! No, I didn’t do that. I simply reinstall/refresh fog with those settings. After reinstall, fog keep settings and run ok!thank you again!