The connection to adb is down, and a severe error has occured. 错误

错误：The connection to adb is down, and a severe error has occured.

[2010-03-11 09:36:56 - HelloOPone] You must restart adb and Eclipse.

[2010-03-11 09:36:56 - HelloOPone] Please ensure that adb is correctly located at 'D:\androidSDKAeclipse\android-sdk-windows-1.5_r2\platform-tools\adb.exe' and can be executed.

解决：
方法1：cmd中adb kill-server，然后adb start-server
方法2：方法1不管用，那么在任务管理器中杀死adb.exe，然后重启Eclipse。

方法3：方法1和方法2都不能解决。

cmd中adb start-server 出现如下：

C:\Users\xxxx>adb nodaemon server
cannot bind 'tcp:5037'

原来adb server 端口绑定失败

继续查看到底是哪个端口给占用了

C:\Users\xxxxxx>netstat -ano | findstr "5037"
TCP 127.0.0.1:5037 0.0.0.0:0 LISTENING 4236
TCP 127.0.0.1:5037 127.0.0.1:49422 ESTABLISHED 4236
TCP 127.0.0.1:49422 127.0.0.1:5037 ESTABLISHED 3840

原来被4236这个进程占用了端口，打开任务管理器，杀掉4236这个进程。（可以在任务管理器菜单，查看->选择列中勾选（PID）进程标识符）

至此问题没有完全解决，再次在cmd中adb start-server

出现:* daemon not running. starting it now on port 5037 *

* daemon started successfully *

重启eclipse，问题解决！