Let me say right away...I am a total newbie to using Apache/Tomcat with Linux for SSO authentication. Please be kind... I am trying to implement SSO with Site Minder in my web application which is on Apache HTTPD/Tomcat 5.0 on a Linux Server. I can see that Site Minder is authenticating and correctly setting the REMOTE_USER attribute. The problem is that this attribute does not make its way from Apache to my web application. I believe it is not getting passed from Apache to Tomcat. It is null when my web application does a call to its custom sspi authentication routine. The setup directions I have give me instructions for Loading the mod_auth_sspi.so class and setting httpd.conf to use it. However, I was told this is a Windows class and will not work on Linux. Can anyone confirm this for me? And if it is not useable on Linux, does anyone have an authentication class that will? Any help you can give will be greatly appreciated....