If your connection to a Wi-Fi router fails, you will see an exclamation point next to the router name in your Wi-Fi settings. Beneath the router name you will see "Saved, secured with ....".  This means the tablet has saved the password you entered, even if that password is incorrect.

By far the most common reason for this error would be an incorrect password.  Any time you see this error the first step in troubleshooting would be to forget and then enter the router password again. To forget the network password, tap the router name, then tap "Forget":

If you are certain the router password you are entering is correct, but you continue to fail to connect to the router after forgetting and re-entering the password, there are several less common reasons the Wi-Fi connection could fail:

• The LeapFrog Epic can only connect to routers on a 2.4 GHz frequency.  Most Wi-Fi routers run at 2.4 GHz, and most routers that run at 5 GHz will run on both 2.4 GHz and 5 GHz at the same time.  Verify your Wi-Fi router is not set to run at 5 GHz only.
• You may be too far from the router. Move closer to the router, then try connecting again.
• Some routers have settings to limit the number of devices that may connect to the router at the same time. To test this, completely shut down one of your other devices that is connected to the router, then try connecting to the router with the Epic tablet again.
• Temporarily turn off wireless encryption or security on your router. By eliminating the password requirement, you can rule out any encryption issues.  If the Epic tablet connects to the router once the wireless encryption is turned off, this would verify the password was the issue causing the failed connection.
• Try restarting the Epic tablet, then go to the Wi-Fi settings and try connecting to the router again.
• Try restarting the Wi-Fi router. While most routers simply need to be unplugged and plugged back in to restart them, refer to your router's manual for specific instructions. Once your router is restarted, verify it is working by connecting a computer, phone or other Wi-Fi device, then try connecting the Epic tablet again.
• Check for wireless interference. Other devices that operate on the same 2.4 GHz frequency as your Wi-Fi router may interfere with the Epic tablet's ability to connect to your router. Try turning off any of these devices which may cause interference: cordless phones, baby monitors, microwave ovens, bluetooth devices, wireless video equipment.