Following actions should be taken.
* The most important thing is to change the default password of your access point.

* Firmware and the drivers of your wireless access point and wireless adapters should be up to date. They should be updates whenever necessary.

* There should be a combination of high level encryption and decent keys (WPA2/802.11i ) recommended.

* Wireless users should be authenticated with different protocols like 802.1X, RADIUS, EAP (including EAP-PAX, EAP-PSK, EAP-TLS, EAP-TTLS, EAP-FAST, EAP-POTP, EAP-IKEv2, EAP-GPSK, PEAP, and EAP-SIM.

* The above protocols give credentials including certificates, usernames, passwords etc.

* Use Wireless LAN Security Tools for securing the wireless network. This software is specifically designed for securing 802.11 wireless networks.

* Use a proxy for outgoing requests.

* Always check the security of the wireless LAN using recent tools like Airbase, AirCrack-ng etc.

* Make strict system logging on all the devices, do check your wireless log files regularly.

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