hi herve,
thanks for your help, using ifconfig to check my network, there is a en1, and no en0, so i follow your step,
delete the interfacts from prefpane + plist as you said, reboot, then check there is en0 only that is wifi adapter. but i still can't login app store.
i have some mistake? any idea to help me? my laptop is Latitude E5430 (very like 6230).
in adation, when i create a connect in network settings panel, there is no ethernet, only, vpn, 6 to 4, vpn, and 802.11n NIC