What kinds of mobile device? Did you try to change some settings on web interface of WPA4220, like channel, security settings etc.?

Laptops connected to WPA281's Wi-Fi but no internet? What's the operating system of those laptops? Is there any IP address, default gateway etc. obtained on your laptops? If you fail to connect,...

Submit a new ticket or re-open 18101 here to complain such a problem and seek help. Good luck. http://ticket.tp-link.com/index.php?/Tickets/Submit

Did you contact support for Spanish Users? http://www.tp-link.com/en/Support/contact/?categoryid=530 For Spanish Users Local No.:+34 902 060365 E-mail: soporte.es@tp-link.com Service Time:From 9:00...

To Test DNS Root fails because the root DNS blocks Ping and it won't affect internet access actually although it shows Fail? If there is any problem, you'd better describe the problem in details. :)

Did you try chipmaker's driver (Realtek RTL8192CU)? http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PFid=48&Level=5&Conn=4&ProdID=277&DownTypeID=3&GetDown=false&Downloads=true Some...