Why cannot STAs associate with an AP when WEP authentication is used

The possible causes are as follows:
- No WEP SSID is added to the STA. Many STAs associate with WEP SSIDs by using encryption without authentication. However, the AP uses both authentication and encryption. Therefore, the STA cannot associate with the SSID. The SSID must be manually configured on the STA. At last, set the encryption type to share mode.
- The key index configured on the AP is different from the key index on the STA. By default, the key index of an AP is 0 (ranging from 0 to 3), and the key index of STA is 1 (ranging from 1 to 4). Key index 0 on the AP matches key index 1 on the STA.

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