How to fix if WiFi does not work right away in Mac OS X 10.11? Look at our solutions to get out of the most common WiFi issues in El Capitan.
Fresh Wi-Fi Preferences in OS X 10.11
Removing all existing WiFi setting would help to solve the problems.
Step 1: Turn Off the WiFi
Step 2: From Finder window, access "Go To Folder" by the combination of "Command+Shift+G".
Step 3: Fill the following line, then hit Enter.
Step 4: In SystemConfiguration folder, locate and delete all the following files:
Step 5: Restart your Mac, then Turn On WiFi to see if it works normally.