The reason it no longer works is because Synology have changed their T&C's around moving licences, even on genuine hardware. Still looking for a more permanent solution, and I'm ready to buy more licences if I get it working. Not very convenient as they have separate timelines. My workaround: I am running separate Xpenology instance on ESXi for every pair of cameras.
I also tried to fall back to the oldest possible surveillance station with no success. Might be that there are some detection mechanisms for non genuine HW. I have also tried the original MAC and SN from the DS112, with still the connection failed message at activation the licence.
I have tried SN and MAC pair generated by the excel file available in the net. Now I have gone over to ESXi based environment and the licence does not activate anymore, giving the 'connection failed' error The same licence worked also on baremetal Xpenology 6.02. I have bought a licence for the 3-rd cam which worked well on DS112 box. Coming back to the initial question with some answers and no solution
