启动Tomcat关于端口号被占用报错

严重: Error initializing endpoint
java.lang.Exception: Socket bind failed: [730048] ?????????×???(Э?é/???????/???)????í??
	at org.apache.tomcat.util.net.AprEndpoint.init(AprEndpoint.java:646)
	at org.apache.coyote.http11.Http11AprProtocol.init(Http11AprProtocol.java:107)
	at org.apache.catalina.connector.Connector.initialize(Connector.java:1014)
	at org.apache.catalina.core.StandardService.initialize(StandardService.java:680)
	at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:795)
	at org.apache.catalina.startup.Catalina.load(Catalina.java:524)
	at org.apache.catalina.startup.Catalina.load(Catalina.java:548)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:261)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
2013-12-4 15:48:21 org.apache.catalina.startup.Catalina load
严重: Catalina.start
LifecycleException:  Protocol handler initialization failed: java.lang.Exception: Socket bind failed: [730048] ?????????×???(Э?é/???????/???)????í??
	at org.apache.catalina.connector.Connector.initialize(Connector.java:1016)
	at org.apache.catalina.core.StandardService.initialize(StandardService.java:680)
	at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:795)
	at org.apache.catalina.startup.Catalina.load(Catalina.java:524)
	at org.apache.catalina.startup.Catalina.load(Catalina.java:548)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:261)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
2013-12-4 15:48:21 org.apache.catalina.startup.Catalina load

    昨天之前机器在启动tomcat时都是好好的，可是就在昨天出现了这个异常。刚开始以为是代码改错了影响了启动，可是找来找去也没有变动的影响代码。在网上一查，发现是端口号被占用了，重启了一下就好了。今天这个情况依然出现，重启也不好用。被占用的端口还杀不掉，只好修改tomcat里的配置端口号：

<Service name="ins-*-platform"> 
    <Connector executor="tomcatThreadPool" port="20020" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8448" URIEncoding="utf-8"/>
	  <Engine name="ins-*-platform" defaultHost="localhost">
      <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/>
   		<Host appBase="webapps" name="localhost" deployXML="false" deployOnStartup="false" autoDeploy="false">
        <Context path="" docBase="ins-*-platform" reloadable="true">
          <ResourceLink global="jdbc/lietou" name="jdbc/lietou.rw" type="javax.sql.DataSourcer"/>
          <ResourceLink global="jdbc/god9" name="jdbc/god9.rw" type="javax.sql.DataSourcer"/>
          <ResourceLink global="jdbc/god9" name="jdbc/god9.ro" type="javax.sql.DataSourcer"/>
        </Context>
      </Host>
   </Engine>
  </Service>

 注意是：port="20020"被占用，改成其他的启动正常。

备注：

windows doc查看端口号命令如下：

netstat -ano

封杀端口号命令：

taskkill /f /pid 6784