Hi willnorris,
Thanks for the pointer, since at this point any advice is welcome. Unfortunately, this is something I'm already aware of, and I'm confident that I have apache/mod_jk/tomcat properly configured. I even confirmed this by writing a tiny servlet that does nothing more than display the result of calling getRemoteUser() to confirm that REMOTE_USER is being properly passed. I'm quite certain that I just had a problem in my application content, because even after hard-coding my credentials in the filter I wrote, authentication was still failing.
Up to this point, every attempt I've made to modify the default pentaho authentication configuration has resulted in either null credentials, or a complete failure of the application to start.
Thanks for your help, though.
Dave



