it is not access control or white list. and if you want to allow only your pc can access the router administrator page, you can setup this way. login router setup age--advanced----system...

try the solution mentioned in this link. http://www.tp-link.com.au/faq-795.html

have you enable remote control? under device--device settings--remote control.

it seems that this AP client to the root ap using mac address not SSID.

do you use VR600 as a modem or router? try a firmware upgrade first.

there is beta firmware, you can send email to support@tp-link.com and ask for that.