Yes, the first time setup you need to connect to the same router that the camera connects to, and enable Remote Control for all cameras.

May I know which device did you open the port 22 for? And how do you know that port 22 is still opened for that device?

Where did you get this firmware(161031)? I cannot find it on the official website. tp-link.com

Do you enable the DoS protection on the router? Or do you set up any rules under parental control or access control?

You can refer to this thread: http://forum.tp-link.com/showthread.php?96265-Archer-c1200-set-up-as-access-point-cannot-search-for-update-or-update-network-time

May I know how large of the building? If there are thick walls surrounding the router, I recommend you to deploy your network in wired connections in the area with thick walls, and extend the network...