Hi, guys. I am having the same difficulties.
I am using a BT-HomeHub router and a Hp Ipaq h5550.
The router is set to WPA-TSK/TKIP and to get my pda to recognise this protocol I had to download a lot of of rom updates.
I can now "see" the wireless networks and the it shows connected on the ipac, however, I can not see the device on the router.
I have now chnaged the settings on the Ipac so they should not match but it STILL shows as connected.
The post that said that they were able to connect that mum's seems to indicate a security type issue.
I would appreciate you thoughts if you have resolved this.