Wifi Network security is meant to protect a wireless network from unauthorized access. At times it may be 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.