But they already have a valid connection, by port forwarding. It’s working, so don’t change it.
This problem may be related to the vague report by your colleague:
It would be good to have a better description of the problem, and have the thread highlighted and pegged, if there is currently a large-scale access problem. I note that there are now a few threads about ‘device offline’.
If you have a server problem that you’re working to resolve, identify it properly and announce it clearly.
