Why request.getRemoteUser() returns NULL ?

[Aris Javier]

i found this in jguru...
 
<Connector port="8009" protocol="AJP/1.3"
protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler"
redirectPort=" 8443" tomcatAuthentication="false"> 
 
it stated there that if i do this in server.xml, request.getRemoteUser()
will not equal to NULL.. ?
 
i did, but request.getRemoteUser() returns NULL 
 
please, anybody.. do you know how to get request.getRemoteUser() to
work?
 
i need it badly! please!
 
aris