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Jan 26, 2016 7:27 AM in response to Ralph Verdultby MrHoffman,Which specific Wi-Fi devices?
Launch Console.app and see if there are any Wi-Fi-related errors getting logged there.
If there's nothing obvious, then remove and re-add the Wi-Fi network connection and see if that clears this.
If that fails, get one and preferably more backups of all your entire data, entirely current copies, and these backups on the off chance that the following might cause problems for your existing data. (I don't expect that here, but your data is the most important thing here.) Then load a newer version of OS X onto an external scratch disk on the problematic Mac, boot from that, and see if you can connect. While OS X 10.8 is getting old, it should still connect — it's possible that something in your current 10.8 configuration might be causing a problem.