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Helpful answers
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Jan 15, 2016 11:44 AM in response to jormisherby Nubz N.,Howdy jormisher,
Thank you for visiting Apple Support Communities.
That you must enter the IP and DNS addresses makes it sound like you have a DNS Server issue. But then you state you can't connect to other Wi-Fi networks.
With that in mind, please check out these articles.
OS X El Capitan: If you can’t join a Wi-Fi network
OS X El Capitan: If you can’t connect to a Wi-Fi network
OS X El Capitan: Solve problems connecting to the Internet
If no help, please give us full details on your setup.
