I've had encountered this problem when trying to get my wireless connection while at home. I found out that it is not because of device issue (i.e network adapter) as i can see my neighbour or my neighbour's neighbour wireless signal but mine unfortunately gone invisible haha -__-"
Since i need to ensure that my wireless connection is stable as i'm doing oncall, so i have come over to the solutions of this matter. Found it while browsing through lowyat.net. So, if you are happened to received the similar error, kindly try below simple steps, it works magic hehe (thanks so much for this guy in lowyat.net for sharing)
Here's the solution:
1) Use a LAN cable to connect your computer to your router or use a friend's PC who could access your wireless network.
2) Log in to your D-Link control panel via 192.168.0.1 in your browser. Enter username as "admin", password leave blank. Click on Login button.
3) Go to Wireless Setup on your left hand panel.
4) Go to Manual Wireless Connection Options section, click on the Manual Wireless Connection Setup button.
5) Go to Wireless Network Global Settings, un-check the Enable Auto Channel Selection option.
6) Change the Wireless Channel to 11.
7) Save the settings. Restart your computer, and then magically, you could reuse your wireless unifi connection again!
Hopefully it works on yours as well :)
