Q: internet Sharing Broken After Yosemite Update

I'm trying to use Internet Sharing on a Mac Mini, sharing the WiFi (connected to the Internet) to Ethernet (which is not).

Worked fine under Mavericks, but doesn't work at all  under Yosemite with the exact same hardware.

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I have a similar issue: when trying to share ethernet connection via wifi (MacBook Pro Mid 2012, Yosemite 10.10.1 14B25), internet stops working both on the Mac and my smartphone I am trying to share internet with.

It seems that there is an issue with routing: the default gateway is not set to the ethernet interface, but rather to the virtual bridge interface. Now, I am not very good at networking, but the following seems to work for me:

1. Look up your default gateway when no sharing is enabled and internet still works (type this in the terminal): "route -n get default | grep gateway"
2. Then, do the standard procedure to enable sharing in "System Preferences -> Sharing".
3. At this point, for me internet does not work (ping does not go through). Set the default gateway to the one corresponding to your ethernet interface: "sudo route delete default ; sudo route add default <gateway ip from step 1>"

Hope this helps.

Thanks for trying to help out, unfortunately it did not help.

My gateway is the same with Internet sharing turned on or off, so setting it manually does nothing.

Note that I'm trying to share from WiFi to Ethernet, your tip might help for those going the other way.

I have gotten it to work now on OS X 10.10.1. Unfortunately I can't give a specific step on how to get it up, I've restarted and reconnected everything and now it seems to be fine.

Same problem, using my old 2008 MacBook Pro with Maverick. Problem seems to be lying in the Migration Assistant. I've completely installed a new Yosemite on my iMac with no help. Same problem with all my 2 other MacBooks migrated to Yosemite. At least I'm not the only one....

FIXED

I had similar problem my Mac is connected with an ethernetcable for the internet and I use that internet for making an WIFI network for my iphone on my room. Before yosemite worked properly after installing yosemite it didn't.

I fixed with a verry simple setting.

Go to System pref > Sharing > Internet sharing *internet delen (on my picture)* click on the square to un-use internetsharing and then click again to activate it.

A pop-up screen wil come up and you press start and now its reseted or something. After this it worked again.

Sorry for my English but its pretty simple and hope this wil work for you guys.

Thanks very much Stoiben for your help.  This solved the problem for me.

Just received a Cellular Network Update from my network carrier Swisscom, and look, it now works. Seems to be a problem to be solved through your cellular network operator!

I have started to have the same problem ever since I have upgraded to OS X Yosemite (now 10.10.3). Having Internet connection sourced from iPhone 4s via USB tethering, and trying to share the connection from MBPR WI-FI.

I suspect it has something to do with the automatic hotspot detection of Yosemite trying to find a network in the WI-FI zone and thus keeping the wi-fi port busy seeking a connection and not using wi-fi to share the Internet connection it already has via USB.

Apple needs to fix  this as this appears to be a more than 1-year old problem unless they want more Mavericks downgraders.

I recently purchased a MacBook Pro Retina 13 (early 2015), I do have the same issue. I can create a hotspot using bluetooth (bluetooth to wifi) : the wifi symbol changes to up arrow. But when I try to do the same using iPhone USB tether to wifi, nothing happens, the wifi hotspot won't enable. It's a really annoying bug, is there a fix for this? I'm using Yosemite 10.10.4

Thanks,

It's a deceptively easy, unintuitive fix. When it prompts you to "Start" or "Cancel" the internet sharing, hit "cancel" first. Then try to start internet sharing again. The second time around, hit "Start". That should allow it to work. You should then see the "Share through Wifi" option remain checked.