OS X Lion and earlier
Apple ships a little-known utility app that helps you analyze and diagnose your Wi-Fi connection, called Wireless Diagnostics. At the end of the process, the assistant generates a report that can be sent to Apple Support for further assistance. As a standalone self-help tool, however, the assistant is not very useful in my opinion. This screen is useful for quick diagnosis of the most obvious problems.
Troubleshoot your Mac's network problems
Another interesting data point to check is the Tx rate which states the maximum possible transfer speed for the current connection. The Wireless Diagnostics panels update with the new live values if the Tx rate changes. Likely the most useful window, Scan relays information about your network and the other networks in the vicinity.
This is particularly important for people who live in congested areas, like a block of flats, where many Wi-Fi stations are setup in close proximity. Scan allows you to see the channels on which these other Wi-Fi routers are operating.
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Unfortunately, the interface is lacklustre and non-interactive: The higher, the better. The tool captures packets from a given channel and saves them to a file.
This is what say's when i go to network preferences: Wi-fi has the self-assigned IP address May 27, 3: Sep 21, 2: Sep 22, I have the exact same problem as OP, and i looked through all of the suggested help and they are unfortunately totally useless. Same as OP's problem. Sep 22, 1: Have you tried simply resetting your modem and then your router?
How to work network diagnostics
There should be a small button on back of the modem that can be pushed in with a pen point that will reset the modem. Then, with the modem connected, simply unplug your router and then plug it back in after about 3 minutes. I had a problem with wifi shortly after getting my new AirPort Extreme - turns out all I needed to do was reset the router unplugging it would not have helped as it has a standby battery. Trouble connecting to wifi More Less. Communities Contact Support.
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Configuring your Mac's network settings
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If you can connect via Ethernet, but not Wi-Fi, see these support articles: I do the same network diagnostics but mine are appear green for wifi, green for wifi setting, greern for the network setting, ISP yellow, yellow for internet and yellow for server.