Packet to client xxxx reached max retries

You can see the following error on your Cisco AP console:

*Mar  1 00:08:07.633: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up
ap01(config-if)#
*Mar  1 00:10:12.078: %DOT11-6-ASSOC: Interface Dot11Radio0, Station   240a.6456.3701 Associated KEY_MGMT[NONE]
*Mar  1 00:10:13.742: %DOT11-4-MAXRETRIES: Packet to client 240a.6456.3701 reached max retries, removing the client
*Mar  1 00:10:13.742: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 240a.6456.3701 Reason: Previous authentication no longer valid

In my case I could not even make a connection (the error occurred when I tried to connect with WLAN on my laptop)

The message means that the AP disassociates the client because the client did not respond to max keep-alive messages sent by the AP. This can be an indication of a bad RF conditions (for example AP interferes with another AP). Configure this command on the AP in order to eliminate this issue and to enable the client to not lose the connection:

ap(config)#
ap(config)# interface dot11Radio 0
ap(config-if)# packet retries 128 drop-packet
ap(config)#

The increase of packet re-tries to 128 with the drop-packet option is a workaround for the bad RF problem (use the drop-packet command to maintain association and drop the packets when the maximum retry value is reached).

Note: The maximum data retries setting determines the number of attempts the access point/bridge makes to send a packet before giving up and dropping the packet. The default setting is 32.

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