My Macs won't network since installing ML

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My Macs won't network since installing ML

I own a mid 2009 Macbook Pro and an Late iMac 2009 21.5". Both were running Snow Leopard and I recently decided to upgrade to Mountain Lion. Since doing so the two computers can not connect using CMD+K, lost the ability to print on a shared printer that was working previously, and can't share files. Airdrop is the only thing the works. I am on a wireless network and nothing has changed except the upgrade to Mountain Lion.

Both are running the exact same version as well. I'm completely lost, any ideas?

iMac, OS X Mountain Lion (10.8.2)

Posted on Dec 28, 2012 4:43 PM

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Answer 1

arthur

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Dec 28, 2012 4:47 PM in response to xiphos83

I'd take a look at the network and sharing preferences. Maybe you have to re-enter the preferences.

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Answer 2

xiphos83 Author

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Dec 28, 2012 4:49 PM in response to arthur

Tried that. Re checked all the boxes and such. No luck there.

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Answer 3

arthur

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Dec 28, 2012 4:53 PM in response to xiphos83

So both computers can access the wifi, but they can't connect to each other?

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Answer 4

arthur

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Dec 28, 2012 4:55 PM in response to xiphos83

In the sharing pane of system prefs, try deleting and then re-entering the shared folders and users for both computers.

And with your printer, maybe there's a driver update for ML.

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Answer 5

arthur

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Dec 28, 2012 4:58 PM in response to xiphos83

Sorry, another idea: when you do command-K, have you tried the "browse" option?

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Answer 6

xiphos83 Author

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Dec 29, 2012 4:01 AM in response to arthur

Thank you for trying but unfortunately none of the above. Neither mac displays the other when the CMD-K "Browse" option is used. I also just noticed in finder that the Shared and Networked Folders are checked off (Showing Back to My Mac, Connected Servers, and Bonjour Computers) to be visible, but neither mac displays them in finder.

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Answer 7

xiphos83 Author

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Dec 29, 2012 11:26 AM in response to xiphos83

I tried to ping each computer using the granted IP Address after resetting my network connections and reconnecting to my wifi router. Each Apple Computer connects to the internet as before but when I ping them, for example 192.168.1.2, I received:

"ping :sendto: No route to host

"ping :sendto: Host is down

I'm running a WPA 2 Personal that's settings have not changed since upgrading to Mountain Lion. I don't think it's any firewall problems.

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Answer 8

Eric Root

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Dec 29, 2012 12:40 PM in response to xiphos83

Do you have some way to hook the two computers together to see if they will see each other without going through the WiFi system?

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Answer 9

xiphos83 Author

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Dec 29, 2012 12:45 PM in response to xiphos83

I was just finishing up when you posted Eric. The two computers did connect when I managed to get out some cable and hook them into the router. Still strikes me as odd since, again, nothing changed other than both updating to Mountain Lion.

I went back to WiFi and then stopped recognizing each other. I reset my wireless settings, nothing. So I completely reset my router using the button and set it up again from scratch. That seems to have worked for now, though it strikes me as very odd seeing as everything down to the IPs that were being used before and after the Mountain Lion upgrade was the same.

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Answer 10

Eric Root

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Dec 29, 2012 12:54 PM in response to xiphos83

I'm glad you got it solved. I have an ethernet switch that stops working whenever it feels like it. Not the logical world we'd like to have.

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