The article provides a detailed list of reason codes commonly found in access point event logs. These codes, ranging from 0 to 45, explain various disassociation and deauthentication scenarios, such as inactivity, insufficient bandwidth, invalid authentication, and security policy issues. Some codes are reserved, while others address specific technical issues like message integrity failures, invalid ciphers, and timeout requests. Understanding these codes helps in diagnosing network issues and improving connectivity.
You may often encounter reason codes (#) in event logs without fully understanding their meaning. Below are some common reason codes related to access point event logs:
| Reason# | Description |
|---|---|
| 0 | Reserved |
| 1 | Unspecific Reason |
| 2 | Previous authentication no longer valid |
| 3 | Deauthenticated because sending STA is leaving (or has left) IBSS or ESS |
| 4 | Disassociated due to inactivity |
| 5 | Disassociated because AP is unable to handle all currently associated STAs |
| 6 | Class 2 frame received from nonauthenticated STA |
| 7 | Class 3 frame received from nonassociated STA |
| 8 | Disassociated because sending STA is leaving (or has left) BSS |
| 9 | STA requesting (re)association is not authenticated with responding STA |
| 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 |
| 13 | Invalid information element |
| 14 | Message integrity code (MIC) failure |
| 15 | 4-Way Handshake timeout |
| 16 | Group Key Handshake timeout |
| Reason# | Description |
|---|---|
| 17 | Information element in 4-Way Handshake different from (Re)Association Request/Probe Response/Beacon frame |
| 18 | Invalid group cipher or Association denied due to requesting STA not supporting all of the data rates in the BSSBasicRateSet parameter |
| 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 |
| 33 | Disassociated because QoS AP lacks sufficient bandwidth for this QoS STA |
| 34 | Disassociated because excessive number of frames need to be acknowledged, but are not acknowledged due to AP transmissions and/or poor channel conditions |
| Reason# | Description |
|---|---|
| 35 | Disassociated because STA is transmitting outside the limits of its TXOPs |
| 36 | Requested from peer STA as the STA is leaving the BSS (or resetting) |
| 37 | Requested from peer STA as it does not want to use the |
| 38 | Requested from peer STA as the STA received frames using the mechanism for which a setup is required |
| 39 | Requested from peer STA due to timeout |
| 45 | Peer STA does not support the requested cipher sui |
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