Mac users who are facing Wi-Fi connectivity problem in OS X EL can resolve this problem by creating a new location with custom DNS setting and an MTU change is enough to resolve this problem. Before getting started, you should start and complete a backup of the Mac with Time machine. Apple technical support from http://applecustomerservice.us can provide you more detailed information on Mac Wi-Fi connection error. To fix this issue, create a new folder on your Desktop and turn off Wi-Fi from the menu item in the top left corner of OS X. Go to the finder and hit Command + Shift + G to bring up the ‘Go To Folder’ command, and choose the path that displays on your screen. Hit return to go to the folder and locate the selected files. Reboot Mac and turn on Wi-Fi on the upper right corner of OS X EL. For any other help regarding Mac wi-fi connection simply log onto http://mac-technical-support.com or dial toll-free number of Apple technical support services from certified Mac technicians.

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External Link: 800-786-0581-Bluetooth Has Stopped Working In Mac With OS X EL Capitan; Get Apple Support | http://bit.ly/2jXDxDx | https://goo.gl/MSBZoE