Hi,
I set DNS to 8.8.4.4 and connection is stable for now until Internet connection is OK and working.
I think that I could describe what seems to be a problem.
Ewon is connected to Internet over WAN port to router.
Problem occurs when both devices are switched off due power outage, and then ewon stays offline even power is back again and Internet connection is OK. I must manually restart ewon once more to connect to VPN.
I looks that ewon is booting much faster then internet router and asks for internet connection even it’s not established yet. Ewon keeps repeating failed DNS report periodically in loop even after internet connection on the site is established and OK and cannot connect to VPN service until I restart device manually. After manual restarting, ewon immediately connects to VPN.