Welcome to Cisco Support Community. We would love to have your feedback.
For an introduction to the new site, click here. And see here for current known issues.
My wireless controller 4402 is running with 802.11a/n and 802.11b/g/n. How do I disable 802.11a, 802.11b, 802.11n and keep the 802.11g?
You can't. Why, oh why, do you want to use only "g"???
You can also try disabling the lower MCS rates.
First of all disable 802.11a in Wireless - 802.11a/n - Network
Then in Wireless - 802.11b/g/n - Network set 12Mb/sec as Mandatory - 11b clients can't support such speed and won't be allowed to connect.