Android USB-Debugging: Device recognized but then loses connection

I followed the steps for USB Debugging showed here under paragraph 8 and my HTC Desire is recognized once:./adb devices List of devices attached

SH0BJPL02419 开发者_JAVA技巧 device

Then I run the exact same command once more and the connection is lost. Sometimes I can also see the devices three times but after a couple of secs the connection is gone.

USB Debugging is still displayed as 'on' on the phone, though.

I use Debian Squeeze 64bit.

Thanks in advance for any help!

Selecting 'harddrive' on the phone did the trick in case anyone is interested.