Shibboleth Developers

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I am trying to use the recommended authentication in the initial beta
instructions (although HTTP Auth will not be useful to me later).  I
verified that I had Apache configured correctly by testing the
authentication against a random directory (jsp-examples) being served by
Tomcat through the JK connector (I'm using Apache 2.0.* and the latest
modjk for Apache 2.0.*).  

When I try to access https://myserver/shib-idp/Authn/RemoteUser my
username/password is never accepted.  It behaves as if I am entering the
wrong username/password.  It is the same username/password that I tested
and verified above when protecting a simple directory.  Additionally the
error page I get for a failed authentication is being generated by
Tomcat, where as the error page generated when I input the wrong
username and password for a diffect directory is generated by Apache.  

Any idea what might be going wrong?  It doesn't seem like Shibboleth
should be involved in this failure, but the fact that the same
protection works fine for jsp-examples another mount served by Tomcat
makes me think there is something special about the Shibboleth servlet
endpoint that is causing an issue.