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I tried to share my Internet connection with another Mac but it failed. I could before I upgraded to Mountain Lion.

I have a 3G USB modem that I use for Internet. I went to System PreferencesSharingInternet Sharing → Select my 3G device from Share your connection from → Tick WI-FI → Setup WI-FI Options... and then enable Internet sharing.

However, the other Mac can see my network but cannot join.

How do I fix this?

HW: MacBook Pro Retina 15"
OS: Mountain Lion

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How near are the machines - the graphic shows that the WiFi signal is too weak, the arcs turn black showing signal strength –  Mark Oct 19 '12 at 14:22
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1 Answer 1

Could you try and disable your Wifi, change the sharing settings so that the security is off (just for testing purposes of course). Enable your Wifi and try again?

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