I am not aware of any of this. I Used my Cubie with Linux (Lubuntu) as well as a Raspberry Pi with Recalbox (distribution for game emulation) and it worked well.
I just cannot understand how the Cubie can be on my network and yet inaccessible. Shall I try to enable DMZ on my router?
I found why it is not working but cannot fix it: I currently have a Lubuntu installed on the NAND and it seems the cubie won’t boot from the SD but on the NAND instead.
Now my issue is the following: how can I make the cubie boot on the SD? In the alternative, how do I wipe the NAND?