im running Brecham Obex 1.7 executable samples on win-7 machine. non of them discover any bt device i have (the add device option of win-7, show my bt devices).

when i try to connect to a remote device using bluetoothclient.connect i get the following exception:

System.Net.Sockets.SocketException (0x80004005): The requested address is not valid in its context F008F13303B8:0000110600001000800000805f9b34fb
   at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)

running CodeProject ObeXplorer programs, i get the same exception.
 

i tried it with 3 different usb bt dongles.

what can be the problem?