Recovering a Linksys security key is nearly impossible unless you know where to go. Once you do, it's simple. Navigating the Linksys support site can be challenging as well; this is the easiest and most direct way to connect to your router and retrieve or change your settings.
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Check for a stored file. When you set up your router, the last step asked you to create a file with your settings. The default location for that file is "My Documents." The default file name is "WirelessSettings.txt". If your settings have not changed since you set up the network, this is all the information you need. If you updated the password at any time, proceed to the next step.
On the computer directly connected to the router, open a browser window and type in: 192.168.1.1 You'll access the control panel of your router, even if you cannot get online.
Type the username in the window that pops up. The default user name is "admin" and the default password is blank.
Click the "Wireless" tab at the top of the screen, then go to "Wireless Security." Your security key is displayed on this page.