Comment 8 for bug 292368

I have the same problem trying to login to a WPA Personal encrypted network. Like the original reporter of this bug, I could connect fine under hardy.
Here's what my windows machine says about the network: (it's using an identical wireless card)
Network-Authentication: WPA-PSK
Data Encryption: TKIP

In Intrepid, I am getting the same response regardless of whether I use linux atheros driver or ndiswrapper, so this is probably not a driver problem. Unfortunately I don't have a copy of Hardy anymore and I'm not sure which package to downgrade, or even how to convince dpkg to downgrade a package.