Eclipse error "ADB server didn't ACK, failed to start daemon"

Thanks, @jowett, I have solved my same problem, doing these steps

Step 1: CTRL+Shift+Esc to open the task manager, which has adb.exe process and end (kill) that process

Step 2: Now, close the eclipse, which is currently running on my computer.

Step 3: Again, restart eclipse then solved that problem.

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For those using OS X

killall adb

For those using Windows

adb kill-server

should do the trick.

I met same problem, though I didn't what caused this. Whatever, i find some clues and fixed finally.

When I open SDK and AVD manager, but find the AVD version(2.3.3) is not same with android lib version(2.3). So I create a new AVD with 2.3.

I fixed it by the following steps: 1. Open windows task manager and kill adb.exe process. 2. Close eclipse and restart it. Then it works.

Hope it helps.

ADB will often fail if there is a newline in adb_usb.ini. Remove it, restart it, and that will often solve the problem (at least for me anyway).