Hi,

I have no luck with getting 802.11n 40MHz channels working with RB2011UiAS-2HnD-IN (updated to 6.9 and latest firmware) and Windows 8.1 laptop with Intel 7260-N card on 2.4GHz. I also have an older laptop with Intel 6250AGN card which has the same problem.

40MHz channels seems to be enabled both in router and laptop wifi card configuration; changing frequencies or 20/40mhz-ht-above/below doesn't make any difference.

Registration screen lists 144Mbps as the Tx/Rx rates and doesn't include any HT40-* entries in signal strength list
Router wireless config information is included below; please do tell me if any other information is required

0 R name="wlan1" mtu=1500 mac-address=* arp=enabled
interface-type=Atheros AR9300 mode=ap-bridge ssid="*"
frequency=2462 band=2ghz-b/g/n channel-width=20/40mhz-ht-above
scan-list=default wireless-protocol=any wds-mode=disabled
wds-default-bridge=none wds-ignore-ssid=no bridge-mode=enabled
default-authentication=yes default-forwarding=yes default-ap-tx-limit=0
default-client-tx-limit=0 hide-ssid=no security-profile=default
compression=no

0 interface-type=Atheros AR9300
chip-info="mac:0x300/0x2, phy:0xcccd, a5:0x0, a2:0x0, eeprom:0x0"
capabilities=tx-power-control,ack-timeout-control,virtual-ap,alignment-mode,
noise-floor-control,scanning,nstreme,sniffing,power-channel,ht40-
g,wmm,spectral-scan,nv2,no-ant-mode,20mhz-sgi,21
supported-bands=2ghz-b,2ghz-g,2ghz-10mhz,2ghz-5mhz,2ghz-n,2ghz-n-10mhz,2ghz-
n-5mhz
2ghz-b-channels=2412:20,2417:20,2422:20,2427:20,2432:20,2437:20,2442:20,
2447:20,2452:20,2457:20,2462:20,2467:20,2472:20
2ghz-g-channels=2412:20,2417:20,2422:20,2427:20,2432:20,2437:20,2442:20,
2447:20,2452:20,2457:20,2462:20,2467:20,2472:20
2ghz-10mhz-power-channels=2412:20,2417:20,2422:20,2427:20,2432:20,2437:20,
2442:20,2447:20,2452:20,2457:20,2462:20,2467:20,
2472:20
2ghz-5mhz-power-channels=2412:20,2417:20,2422:20,2427:20,2432:20,2437:20,
2442:20,2447:20,2452:20,2457:20,2462:20,2467:20,
2472:20
ht-chains=0:chain0,1:chain1

lower the frequency to 2452 or lower if you use above option as 2462 doesn't support above option:
http://en.wikipedia.org/wiki/802.11n#40 ... 4.C2.A0GHz

Changing frequency to 2452 helped, thanks!

It seems there are specific combinations of frequency/HT above/below which do work (e.g. setting of HT below with 2462MHz doesn't work while it supposedly should)

edit: CIFS issue was solved by rebooting CIFS server, nevermind