Hallo,
könnte es sein, daß ein Connection-Problem existiert? Könnte eventuell möglich sein?
Note: AVR Dragon must sense the target voltage at pin 2 on the ISP header in order to set up the level-converter. For on-board targets, the voltage must be supplied from pin 2,4,6 on the VCC header (5V) into pin 2 (VTG) on the ISP header. When using off-board targets there should be no connection between VCC header and pin 2 of the ISP header.
Connect the 6pin cable from the AVR Dragon to the external target as shown in these pictures:
Gruß von Oskar01