Wireless Exist and Not Exist

[jotnarta]

Hi All

I have a wireless network at my home, when I go to my work, I change the connection to be a static IP and a proxy. Yesterday, I connected to wireless network and the signal was excellent. But today, when I tried to connect I couldn't.

The strange thing is that my laptop detected the wireless, and when using (iwlist scan) command, it shows that it exist and detected, but I can't browse.

Besides, I removed the wired connection from the network manager, but the network icon don't change in the task bar, it always displays the wired connectioin icon, and not the wireless despite that I choose the wireless network

Why? any help please?
Jotnarta