关于Apache Tomcat 4.0设置的问题？

黑色领带

j2sdk1.4.0、Apache Tomcat 4.0装好后应该如何进入管理页面呢？

进入http://127.0.0.1:8080/admin/contextAdmin/contextAdmin.html
提示：Apache Tomcat/4.0.1 - HTTP Status 404 - /admin/contextAdmin/contextAdmin.html

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type Status report

message /admin/contextAdmin/contextAdmin.html

description The requested resource (/admin/contextAdmin/contextAdmin.html) is not available.

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why？？