Problem with Ad Hoc wireless network

Hey there,

I created an Ad Hoc network in my Windows 7 Ultimate based PC (x64, I created the Ad Hoc network without 3rd party software) so I can use my mobile to browse the Internet, since my router isn't wireless.

For some reason, if I create a secured Ad Hoc network (with either WEP or WPA2), I can't join it, even when the password is correct. Mobile device says "failed to join". However when it's not secured I don't have any problems joining and using the network.

I prefer to have a password protected network, so my neighbors won't be able to eat my bandwidth.
Any ideas how to solve this? Also it would be okay if I could block certain clients from connecting, however I didn't find that feature in the "Manage wireless networks".


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