Wifi PIN vs WPA passcode

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http://askubuntu.com – I have troubles connecting to a wireless network using my Linux machine. My general settings work, so I can connect to other networks. When I try to connect in Windows, I am asked for a PIN (which I don't know), but can circumvent this by clicking on a "enter WPA passcode instead" button. The passcode I have got works. However, when I enter the same passcode in Linux I can not connect. I assume I should enter the "PIN" here as well. Is there a way to tell the network manager to connect the same way windows does? Thanks for any hints (HowTos)