I tested the Adv-N 6235 following Sergey's blog running Linux provided by Intel and its working. I noticed a difference in the negotiation between your card <-> router and my card <-> my router, I also noticed that your card did not obtain IPv4. When I execute "ifconfig wlan0", the output is:
wlan0 Link encap:Ethernet HWaddr B4:B6:76:F5:AC:B7
inet addr:172.20.10.14 Bcast:0.0.0.0 Mask:255.255.255.240
inet6 addr: 2600:1010:b10f:2bd9:b6b6:76ff:fef5:acb7/64 Scope:Global
inet6 addr: fe80::b6b6:76ff:fef5:acb7/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:38 errors:0 dropped:0 overruns:0 frame:0
TX packets:30 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6100 (5.9 KiB) TX bytes:4355 (4.2 KiB)
Lines 2 and 3 above shows my card negotiated with my router and successfully obtained IP address, I believe your card working fine but your router rejecting it, check your router configuration.
Lineslinll