adding transport gauruntee ti web.xml issues

[Yucca Nel]

In tomcat 6 I am bringing down the container when asking for  confidential 
RESOURCE. iS THERE A REASON FOR THIS? 

CONTAINER AND RESOURCE WORK FINE LIKE THIS...

<security-constraint>
        <web-resource-collection>
            <web-resource-name>loggedInUser</web-resource-name>
            <url-pattern>/pages/user/secure/*</url-pattern>
            <http-method>GET</http-method>
            <http-method>POST</http-method>
        </web-resource-collection>
        <auth-constraint>
            <role-name>RegisteredUser</role-name>
        </auth-constraint>
        
    </security-constraint>

But fail when configured like this...

</security-constraint>
    <security-constraint>
        <web-resource-collection>
            <web-resource-name>AdminArea</web-resource-name>
            <url-pattern>/pages/admin/*</url-pattern>
            <http-method>GET</http-method>
            <http-method>POST</http-method>
        </web-resource-collection>
        <auth-constraint>
            <role-name>Admin</role-name>
        </auth-constraint>
        <user-data-constraint>
            <transport-guarantee>CONFIDENTIAL</transport-guarantee>
        </user-data-constraint>

    </security-constraint>