Linux desktop 1.7 won't sync (buttons grayed)

I've got qtopia desktop 1.7 installed on a Mandrake 9.1 system,
and I can't figure out how to get the desktop to sync:  the
sync buttons and menu entries are always disabled.

I've tried using both usbnet and usbdnet modules.  I can ping
the Z using either usbnet or usbdnet.  I've tried both USB
I/O and USB TCP/IP setting on the Z, and neither works.

Watching the network traffic, it looks like qt-desktop is
trying to open a TCP connection to port 4243 on the Z, and it's
refusing the connection.  The Z is running Sharp ROM version 3.1.

-- 
Grant Edwards
[email protected]