usb blaster and ep2c5 mini board - jtagconfig hangs

Environment: quartus 10.1sp1 (linux)
Trying to set up an ep2c5t144 mini board with usb blaster clone (zrtech brand).
I connect the usb blaster to usb host first, then to ep2c5 board, then power up the board.

I start jtagd --foreground --debug (as super user to avoid permission issues), and run jtagconfig -d in another window.
Status light on the usb blaster changes from red to blue.
jtagd messages:
USB-Blaster bulk queuing implied, async mode
USB-Blaster port (/proc/bus/usb/001/005) opened
USB-Blaster added "USB_Blaster [USB 1-1.1.2]
USB-Blaster port (/proc/bus/usb/001/005) opened
jtagconfig messages:
1) USB_Blaster [USB 1-1.1.2]
and then jtagconfig hangs forever, without finding the EPCS4 on the board.

What is the next diagnosis step? (I have a screwdriver and an oscilloscope.)