- 

- In Sharing preferences, uncheck Internet Sharing. 

- Restart your Mac. 

- Create a new Internet Sharing network with the settings you wish, for example with Security set to WPA2 Personal instead of None. 

OS X: Device using Internet Sharing is not able to connect to the Internet
After creating a Wi-Fi network using Internet Sharing, computers and devices can connect to the Wi-Fi network, but may not be able to connect to the Internet.

 
This can happen if you make a subsequent change in Sharing preferences to Internet Sharing while the Mac is already providing a Wi-Fi network connection.
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