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Android “Unable to open sync connection” error

By Radu Motisan Posted on July 22nd, 2011 , 1555 Views (Rate 2.33)

Most of the time the Android tools work ok, but sometimes, out of the blue, ADB starts doing nasty things, such as throwing error messages and refusing to work.

I got the "Unable to open sync connection" in Eclipse console, so I tried a few things:
- unplug/re-plug the cable
- restart eclipse
But these didn't solve the problem. I am currently using Win XP and a HTC Desire Android phone.

The solution was to go to Settings -> Applications -> Development on the Android device, and disable then re-enable the USB-Debugging option. Probably this is related to the ADB server running on the mobile device.