Ensure that you are running Apache Tomcat (the web application server) behind Apache HTTPD (the web server). This is required as the Shibboleth authentication is performed in Apache HTTPD, while DSpace runs within Apache Tomcat. A guide to do this is available at There are two ways how to do that - using mod_proxy_ajp or mod_jk - both are described on https://wiki.duraspace.org/display/DSPACE/ModJkDspaceOnStandardPorts
Follow the standard instructions for installing a Shibboleth Service Provider (SP) in Apache HTTPD. Instructions are available from https://spaces.internet2.edu/display/SHIB2/Installation
...