As far as I understand you managed to redirect the device successfully and it is connected to the server ok, is not it?
Could you please try to use "USB over Network" product. We need to check if this product can work. It has the similar functionality. Please take a look at it here:
http://www.fabulatech.com/usb-over-network.html
If it works and Windows Mobile Device Center can detect your PDA we will know how to resolve the issue.
Yes, you understood correctly. I now tried 'USB over Network' and the same think happened i.e. the device is seen on the Remote Desktop but Windows Mobile Device Center does not detect my PDA.
Please check your e-mail box for beta version of USB for RDP. But before installing it please uninstall the old version and reboot. Please let us know if it worked.
Following the last email, I've installed USB for Remote Desktop, and the software on the server side is reporting: "Symbol USB ActiveSync RNDIS - Symbol Technologies, Inc (occupied by another user)."