If you ever find yourself locked out of your Linksys router don't worry. Resetting a Linksys router back to it's default factory configuration is easy.
#1 - Prepare for the reset by removing any Ethernet connections attached to the router.
#2 - Locate the reset button on the back of the router. If you press and release the reset button the router restarts.
#3 - Press and hold the reset button while you count to 10. At "10" continue pressing the switch and turn off the power to the router (turn off the switch or pull the power plug). Count to 10 again. Turn the power back on. When any of the LEDs (lights) on the front of the router turn on (the power LED should turn on first) then let go of the reset button.
#4 - Connect one PC back to the Linksys router via the Ethernet. This PC should be set up to acquire an IP address via DHCP. After connecting the PC it should have an IP address with 30 seconds. You can check to see if the PC has an IP address using the command "IPCONFIG" at a DOS prompt. By default the Linksys will set it's IP address to 192.168.1.1. You can verify this by typing "IPCONFIG" and looking at the IP address of the default gateway (it should be 192.168.1.1).
#5 - Open a browser and enter the URL "http://192.168.1.1" (without the quotes). If asked for a username leave that field blank. If asked for a password enter "admin".
# 6 - The first thing you should do is to change the default password on the Linksys router. The next thing is write the new password down. If you've lost or forgotten the password for your router let me suggest taping the new password to the bottom of the unit. This is not the most secure means of recording this information; but if your router is locked inside your house you have already removed much of the associated risk.
#7 - The next thing you should do is check the Linksys web site to find out if you are running the latest version of Linksys firmware.