Can't connect to any site on MacBook. here is the problem. On my MacBook Pro with mavericks I can't connect to any site with working wifi(checked it on ipad). Also, Skype and utorrent are working fine, but all browsers can't connect. Restart MacBook and wifi didn't help.
If you are able to use Skype and uTorrent, but not able to use Safari or Chrome, I would recommend that you try resetting the SMC. In my comment above, I recommended trying to ping external addresses which would determine the status of your network connectivity.