How did you access it remotely? Domain name or IP address? What kinds of domain IP? Try WAN IP address.

D7 has no PoE feature.

If you untick "connect automatically", the network profile won't be saved. To reconnect to the network, you have to untick it again, press connect and enter Wi-Fi password. Did you check if network...

For the TP-Link Archer C9 V1, the beta firmware 150908_beta, does not allow/work with SLAAC Can you explain it in details? No SLAAC option? Or Failed to obtain IPv6 address? Or any other problem with...

The extender and your main router are using the same Wi-Fi name? Without turnning off the extender, if you forget the network on your wireless clients and reconnect, does it work? How about wired...

Why not use method two in quick installation guide to log in web interface of WA854RE and set it up? http://www.tp-link.com/res/down/doc/TL-WA854RE_V1_QIG.pdf