@Norbert_123 

The SDN routers for TP-LINK are a complete disaster, if you need a stable router then take it out of SDN, it works so much better. Switch and Access Point work fine under the SDN platform but not routers.

So if you have the opportunity, run routers in stand alone then you avoid a lot of the problems with adopt and configuration. vpn that will not start as well as major problems with L2TP and PPTP ++++

But to get out of your problem now you can try and take the power on the router wait a bit and look at the power again.

@shberge Yeah I know, just did it and after few restores/resets/reboots it started to work, but is seems like a wishful-technology rather than technology that just works.

I'm seriously thinking on selling all TP-LINK devices as decision on going into Omada SDN has been made because I had to have a centralized solution for all network. Taking out any piece of SDN mean that I do not need to stick to TP-LINK at all...

@Norbert_123 

The technology is nice with great potential so I am waiting anxiously for ver5.x but there have been more than a lot of problems with the routers for TP-LINK,

but with ver1.1 it is no problem to run stand alone, so some of the remote routers that I do not have access to physically are taken out of SDN to drop probems.

And or if TP-LINK fix the big big problem with instability  then I put the router back in SDN platform. 

So my suggestion is wait and see   temporary tak out routers from SDN and wait for stability upgrade on critical routers. I think this will be fixed or TP-LINK have no product to to sell soon.