Understanding intel wifi error codes

Today I was unable to connect to my home access point eventhough the key is correct. I searched the log files and found the following entries: NetworkManager: [1486388354.0812] device (wlan1): supplicant interface state: scanning -> authenticating kernel: wlan1: RX AssocResp from 80:c6:ab:49:02:e6 (capab=0x411 status=18 aid=0) kernel: wlan1: 80:c6:ab:49:02:e6 denied association (code=18) NetworkManager: [1486388354.0865] device (wlan1): supplicant interface state: authenticating -> associating Question: Where can I find more information about the AssocResp with capab=0x411, status=18 and aid=0. Or how can I find out why the association was denied? When I am connecting network manager does not give me any kind of error message and just keeps prompting me for the password so the above log entries are the only clue that I currently have. **Update** After playing a bit with my routers wireless settings I realized that the problem was comming from an option named: 802.11 N Support Required When I switched this to off my notebook was immediately able to connect to my wireless network. NetworkManager: [1486736944.1725] device (wlan1): supplicant interface state: authenticating -> associating kernel: wlan1: associate with 80:c6:ab:49:02:e6 (try 1/3) kernel: wlan1: associate with 80:c6:ab:49:02:e6 (try 2/3) kernel: wlan1: RX AssocResp from 80:c6:ab:49:02:e6 (capab=0x411 status=0 aid=1) wpa_supplicant: wlan1: Associated with 80:c6:ab:49:02:e6 kernel: wlan1: associated NetworkManager: [1486736944.2821] device (wlan1): supplicant interface state: associating -> associated However I know for sure that my wireless card is able to connect to class N wifi networks. Checking with lshw for the current wifi driver confirms that the wireless interface for wlan1 is a **Centrino Advanced-N 6205** from Intel.