FCKeditor 在 linux 下 无法上传图片的问题！急！！！

我在windows 下一切都正常， 但是移植到linux apache + tomcat5.5 下 在上传图片的时候 点击 “浏览服务器” 后 就报

The server didn't send back  a proper XML response . please contact your system adminstrator .
XML response error : Not Found(404)

而且上传图片的时候，进度条就一直在那里滚，上传不上去

配置如下：
web.xml中配置：


<!-- 在线编辑器-->
<servlet>
<servlet-name>Connector </servlet-name>
<servlet-class>
net.fckeditor.connector.ConnectorServlet
</servlet-class>
<init-param>
<param-name>debug </param-name>
<param-value>true </param-value>
</init-param>

<load-on-startup>1 </load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Connector </servlet-name>
<url-pattern>
/fckeditor/editor/filemanager/connectors/*
</url-pattern>
</servlet-mapping>

fckconfig.js文件：
//FCKConfig.UserFilesPath = '/userfiles/' ;
//FCKConfig.UserFilesAbsolutePath = __FILE__ ;
FCKConfig.CustomConfigurationsPath='';
FCKConfig.EditorAreaCSS = FCKConfig.BasePath + 'css/fck_editorarea.css' ;
FCKConfig.EditorAreaStyles = '' ;
FC