@Virgo 

Hi Virgo

Thanks for your reply. Yes the internet access ist down, also the wifi connection ist down.

My Server restarted once a day. In this time have no connection to my intranet and to internet.

Another case:

When Server is down, it works fine. The Omada Devices works. But when I started the Server again, the connection down for a short time.

I have an EAP225 and a R605 Router, both is connected to the Omada SDN.

I created a post about this a few days ago, and I am having the same issue when controller is rebooted WAN drops for 2-5 minutes.  I also see a few other recent posts about this.  I am running on Linux as well, but have seen folks that have the OC controller also having the same issue when it is rebooted, it's during the "Adoption" or "Configuration" stage for the router on reboot.

I have all Omada (Router, Switch, 2xAPs).  When this happens I get an alert of WAN Down in the controller and everything on the network wired or wireless loses internet connection.  WiFi devices do not disconnect from the APs, they just lose internet.  Anything internal / LAN related is still fine during this time.

My post here for reference: https://community.tp-link.com/en/business/forum/topic/265070