MacOS – Share a wifi connection via another wifi connection

You can't "share" a Wi-Fi connection via a Wi-Fi hotspot.

What is misleading everybody is the inapropriate use of the technical term of sharing when the function we are talking of is a redistribution.

When 2 PC are connected on the same Wi-Fi hotspot they are truly sharing the same connection: they are using the same Wi-Fi channel, they are sharing the router IP public address.

When you start up InternetSharing within System Preferences > Sharing you are not starting a sharing, but the redistribution of a main network access toward a secondary network access. On this secondary network access, you are acting as an access router. You are distributing IP private addresses. On your primary network access you have a public IP address, on your secondary network access, you have a private IP address, and you translate the traffic IP addresses from the public side toward the private side and the other way around. To be able to perform this redistribution of IP traffic coming from your primary network access toward the same physical access your OS should be able to present you this physical interface as 2 differents virtual interfaces, typically en1 and en2.

MacOS X doesn't provide such a virtualisation function.

You can't redistribute your Ethernet connection toward your Ethernet connection.
You can't redistribute your Wi-Fi connection toward your Wi-Fi connection.

Connectify (on Windows 7) is simply selling a standard function of Windows which permit to create 2 virtual Wi-Fi interfaces on top of one physical one (see: Wi-Fi hotspot for Windows 7). Then Windows redistribute the network access of the primary Wi-Fi toward the second one.

Your messages says it clearly.

Your Internet can not be shared!

It is prohibited to do so by a set up called 802.1x.

Your network administrator(or you) has created the 802.1x configuration profile to connect to 802.1x type network.

That profile does not allow you to share wifi (for security reasons).

If you have access to the 802.1x then you can change that.

If you do not have access:

Try creating NEW Location ! (without the 802.1x configuration).

Under Apple(top left) select Location > Network preferences

In the new Network window click on the Location then select Edit..

Now click on the (+) to add new location (name it)

Now select (add with +)the wifi to use, and add Bluetooth PAN (with (+))

Now go to sharing and Enable Internet sharing with BT PAN.

Do not forget to turn off and turn on the WiFi to enable it.