WEP key must match on the Access Point (AP) and on any wireless device which associates with the Access Point
To resolve this issue, check to make sure that the Wired Equivalent Privacy (WEP) key used to transmit data is set up exactly the same on the Cisco Access Point (AP) and on any wireless device with which it associates. To ensure that you have the same WEP key on both the Wireless devices, reconfigure the WEP key on the devices. To reconfigure the WEP key, you have to overwrite the existing WEP key.
For information on how to configure WEP and WEP features on the Access Point, refer to Configuring Cipher Suites and WEP. For information on how to configure WEP on Cisco Aironet 802.11a/b/g client adapter, refer to Enabling Static WEP section of the document.
Note: When WEP keys are configured on the AP and on the client, make sure they are entered in the same key slot.
Client / Device cannot authenticate
Associated but cannot pass any traffic
Device cannot associate
WLAN adapters (wireless card) / ACU (Aironet Client Utility)
Wireless client to AP