OS X Yosemite: About Wireless Diagnostics
Wireless Diagnostics analyzes the Wi-Fi network your Mac is connected to, and provides solutions to help resolve wireless connectivity issues.
If you can connect to your Wi-Fi router, but have issues loading webpages, sending or receiving email, streaming music or video, use Wireless Diagnostics to analyze the network’s connection to the Internet. After Wireless Diagnostics has completed an analysis of your Wi-Fi network, it lists any issues it finds and offers some solutions.
Wireless Diagnostics collects detailed logs you can provide to a network specialist, network administrator, or an IT support person.
Wireless Diagnostics generates a compressed file containing details found during the diagnosis that is saved to the desktop of your Mac. The file’s name starts with WirelessDiagnostics- and ends with .tar.gz. This file may be useful to your network administrator, service provider, or IT support person.
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Quit all open apps.
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Try to join the Wi-Fi network you’re having problems with (if you are not already connected).
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Hold down the Option key, click the Wi-Fi status icon
in the menu bar, then choose Open Wireless Diagnostics. -
Enter your user name and password, then click Continue.
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Follow the onscreen instructions to analyze your network connection.
For more information about using Wireless Diagnostics, see the Apple Support article About Wireless Diagnostics.