We just got a 1250 AP and are trying to configure 802.11n on it. We were using WPA(Enterprise) and TKIP and I got the message below:
Apr 8 14:24:12: %DOT11-4-NO_HT: Interface Dot11Radio0, Mcs rates disabled on vlan 132 due to not using AES encryption or encryption is not disabled
Users who connected got only speeds up to 54Mb/s.
I changed the ciphers to use AES-CCM instead of TKIP, the message went away and hosts were able to connect with 802.11n speeds.(m1.,m2.,etc)
The log message makes it seem like you have to use AES, is this the case or do I need to add something to the config?