http://www.tp-link.com/en/support/download/?model=TL-WN422G&version=V2#tbl_a download TL-WN422G_v2_10061

Maybe this can work, set a white rule and allow access to port 80 only

As I replied in another thread, the radius can't work with Archer C7. It's absolutely a bug. I have tested both Archer C7 and WDR4900, it works with WDR4900.

WDR4300 is one of he TP-LINK top routers. Firmware is not so good, but great hardware. I'm think it can fulfill your need.

I'm afraid not. I have a Archer C7 and a Wit With WDR4900,radius can work, but Archer C7 no.. It's a serious bug. I have reported it to TP-LINK, and they promise there will be fix in the future...

The latest firmware fixed some vulnerabilities and improved security according to the release note. Maybe the malfunction of the security mechanism caused this problem.