Mac troubleshooting: What to do when you can't connect to the Internet
If your Web browser, email program, or any of a hundred other Internet-connected apps on your Mac starts complaining about not having a connection, you may have to do a bit of sleuthing to figure out the cause. After all, a disruption anywhere along the chain between your Mac and a distant server could cause an outage, and it’s not always obvious where to look.
I suggest trying each of the following steps, in order, until you’re able to connect again.
1. Try another site or app
To make sure the problem isn’t restricted to just one website, try visiting another—preferably one that’s highly reliable, such as Google.com.
Similarly, to make sure the problem isn’t just your current app (such as your email program or Web browser), try connecting to the Internet with another app. If only one site seems to be having problems, try visiting Down For Everyone Or Just Me and entering the problematic site’s URL. The service will tell you whether computers elsewhere on the Internet can successfully connect to the site.
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http://www.macworld.com/article/2028982/mac-troubleshooting-what-to-do-when-you-cant-connect-to-the-internet.html
