Network icon shows disconnected when connected

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http://askubuntu.com – I'm using Ubuntu 11.04 in my desktop PC and wired-lan for connecting internet. I'm able to connect with internet without any problem. But the network icon in the notification area always showing disconnected. Here the first icon represents network icon and it shows always diconnected even when connected to network. And when I click Connection Information from the menu I'm getting the error No valid active connections found!. I tried searching and I couldn't find a solution. How this can be fixed? Thanks in advance. (HowTos)