Apple has made the iOS 4.2 available for its consumers in order to fix the Wi-Fi bug which was earlier found in a few iOS based devices, but it seems like now after upgrading the firmware, most of the devices are being hit. There were earlier speculations that the new iOS 4.2 launch was delayed because of the WiFi bug and it would be first fixed and then launched.
Currently the problem is that when you try to connect to the internet afer upgrading to the latest firmware it wont be allowing you to connect to the net. Here is the detailed demo on this problem made on a Apple iPad. First when you tap on the Settings > Wi-Fi, and when you tap on your desired wireless network, the connection would be established after the authentication as shown below.
But as you can find in the above iPad screen capture, the Wifi symbol on the top left is missing even after the activation of a wireless network, which is clearly a bug. In order to verify the same we went ahead trying out a Speed Test through a previously installed application on the device.
In the above capture you can find that the application tried to download a test file for more than 30 seconds but no data was downloaded, even when the Wi-Fi icon and the loading icon would be displaying on the top left side of your device. This clearly shows that there seems to be no active connection to the device through the local wireless network, while the same is accessible to previous firmware versions.
In order to ensure that the Wi-Fi icon is displayed on the device, you need to run any internet connecting application or a website through the safari browser which can display the same or else try to Enable the Bluetooth for a minute following which the Wi-Fi is activated. This quick fix did work for a few times we tried but is not a full-proof solution for this problem and we hope that Apple would release a quick update which could fix this problem permanently.
Do try to restart the Apple iPad after repeatedly Turning Wi-Fi ON & Off for a few times. Also its better to tap on the ‘Forget Network’ within your desired wifi and then try to reconnect to the same. This could ensure that every old setting is cleared and the device would try to connect to the network again after the reboot.