Wifi Network security is meant to protect a wireless network from unauthorized access. Sometimes it happens that users are unable to connect to a wifi network which is encrypted with WPA. The WPA encrypted Wifi Network asks for an authentication key before a connection can be made. If a valid key is provided and the user is still unable to connect to a wifi network encrypted with WPA, there could be a problem in the channel. Even if the status of the signal strength is good, there could be some congestion on it. Selecting a different channel can help solve the issue.
Channel 11 is the default channel in all configurations and it is possible this has caused interference with the signal. Changing the channel should stop this.
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