[FJames]

A security camera is inherently a two-way device, and it does listen on the port and respond. That's the way it functions, so you can access it from the internet. Router NAT and firewalls don't help in this case. NAT can't hide a forwarded port. Firewalls only block unsolicited connections for devices that aren't intended to respond to unsolicited connections. That's why the camera needs a secure login. The same is true of the Calibre server if you leave it set up and running to access from outside over the internet. The Kobo Touch browser only works with the Calibre server because Calibre is not set to use a password. If I do set a password in Calibre, the Kobo Touch browser returns "401 Unauthorized" instead of prompting for the password.