2012-08-21 21:20:00 - ddms] Failed to initialize Monitor Thread: Unable to establish loopback connection
[2012-08-21 21:20:05 - DeviceMonitor] Connection attempts: 1
[2012-08-21 21:20:27 - DeviceMonitor] Connection attempts: 2
[2012-08-21 21:20:49 - DeviceMonitor] Connection attempts: 3
[2012-08-21 21:21:11 - DeviceMonitor] Connection attempts: 4
[2012-08-21 21:21:33 - DeviceMonitor] Connection attempts: 5
[2012-08-21 21:21:55 - DeviceMonitor] Connection attempts: 6
[2012-08-21 21:22:17 - DeviceMonitor] Connection attempts: 7
[2012-08-21 21:22:39 - DeviceMonitor] Connection attempts: 8
[2012-08-21 21:23:01 - DeviceMonitor] Connection attempts: 9
[2012-08-21 21:23:23 - DeviceMonitor] Connection attempts: 10
[2012-08-21 21:23:45 - DeviceMonitor] Connection attempts: 11
[2012-08-21 21:24:06 - adb] ADB server didn't ACK
[2012-08-21 21:24:06 - adb] * failed to start daemon *
[2012-08-21 21:24:06 - DeviceMonitor] adb restart attempts: 1
[2012-08-21 21:24:28 - DeviceMonitor] Connection attempts: 12
[2012-08-21 21:24:49 - adb] ADB server didn't ACK
[2012-08-21 21:24:49 - adb] * failed to start daemon *
[2012-08-21 21:24:49 - DeviceMonitor] adb restart attempts: 2
[2012-08-21 21:25:11 - DeviceMonitor] Connection attempts: 13
[2012-08-21 21:25:32 - adb] ADB server didn't ACK
[2012-08-21 21:25:32 - adb] * failed to start daemon *
[2012-08-21 21:25:32 - DeviceMonitor] adb restart attempts: 3
[2012-08-21 21:25:54 - DeviceMonitor] Connection attempts: 14
[2012-08-21 21:26:15 - adb] ADB server didn't ACK
[2012-08-21 21:26:15 - adb] * failed to start daemon *
[2012-08-21 21:26:15 - DeviceMonitor] adb restart attempts: 4
[2012-08-21 21:26:37 - DeviceMonitor] Connection attempts: 15
求解！求解
------解决方案--------------------
如果是偶尔出现这种情况，比如，USB口更换手机连接就会出现这种情况
解决办法：
1、重启adb；
2、打开任务管理器，结束adb相关的、eclipse相关的一切进程，然后重新开eclipse；
3、以上方法还不行，建议重启。
------解决方案--------------------
解决办法：
dos下进入SDK目录下的tools目录，执行以下命令：
adb kill-server
adb start-server
如果还有这个问题，请关闭你的防火墙，OK！