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What is the meaning of 802.11 Deauthentication Reason Codes? Controller icon

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David Mössner
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The following table describes the deauthentication reason code. With explanation for the most common one's

 


Code 802.11 definition Explanation
0 Reserved Normal working operation
1 Unspecified reason We don’t know what’s wrong
2 Previous authentication no longer valid Client has associated but is not authorised.
3 station is leaving (or has left) IBSS or ESS The access point went offline, deauthenticating the client.
4 Disassociated due to inactivity Client session timeout exceeded.
5 Disassociated because AP is unable to handle all currently associated stations The access point is busy, performing load balancing, for example.
6 Class 2 frame received from nonauthenticated station Client attempted to transfer data before it was authenticated.
7 Class 3 frame received from nonassociated station Client attempted to transfer data before it was associated.
8 Disassociated because sending station is leaving (or has left) BSS Operating System moved the client to another access point using non-aggressive load balancing.
9 Station requesting (re)association is not authenticated with responding station Client not authorized yet, still attempting to associate with an access poin
10 Disassociated because the information in the Power Capability element is unacceptable  
11 Disassociated because the information in the Supported Channels element is unacceptable  
12 Reserved Not Used or Special Purpose
13 Invalid information element, i.e., an information element defined in this standard for  
which the content does not meet the specifications in Clause 7  
14 Message integrity code (MIC) failure  
15 4-Way Handshake timeout  
16 Group Key Handshake timeout  
17 Information element in 4-Way Handshake different from (Re)Association Request/Probe  
Response/Beacon frame  
18 Invalid group cipher The link speed requested by the client or AP is incompatible. (i,e. trying to operate N only speeds on a G AP)
19 Invalid pairwise cipher  
20 Invalid AKMP  
21 Unsupported RSN information element version  
22 Invalid RSN information element capabilities  
23 IEEE 802.1X authentication failed  
24 Cipher suite rejected because of the security policy  
25-31 Reserved  
32 Disassociated for unspecified, QoS-related reason Quality of Service has denied the action
33 Disassociated because QAP lacks sufficient bandwidth for this QSTA  
34 Disassociated because excessive number of frames need to be acknowledged, but are not  
acknowledged due to AP transmissions and/or poor channel conditions  
35 Disassociated because QSTA is transmitting outside the limits of its TXOPs  
36 Requested from peer QSTA as the QSTA is leaving the QBSS (or resetting)  
37 Requested from peer QSTA as it does not want to use the mechanism  
38 Requested from peer QSTA as the QSTA received frames using the mechanism for which  
a setup is required  
39 Requested from peer QSTA due to timeout  
40 Peer QSTA does not support the requested cipher suite  
46-65535 46--65 535 Reserved  
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