There is a troubleshooting guide. http://www.tp-link.com/en/faq-400.html

Pet wrote i have a PPTP vpn from work, i just want connect my pc back to server at work via the modem at home. If so, you just need to configure PPTP client on your PC which is remotely from your...

VPN Passthrough is enabled in default settings and it cannot be configured. Also, it doesn't support any other VPN configuration, like IPsec Site to Site etc.. What are you trying to fulfill?

Does your router have bandwidth control feature? Why we need Bandwidth Control? (Copied from FAQ on TP-LINK website, lol) Within a normal home network, the bandwidth is shared by all computers. This...

@impression The problem has been fixed in the latest firmware. :rolleyes: http://www.tp-link.com/en/download/TL-WA801ND_V2.html#Firmware

What are you trying to fulfill? Describe in details. Both of C9 will be working as access points?...