Thanks for the reply Tobias.
The only parameter that I have created/changed is icm/HTTP/error_templ_path. I know that part is working beacuse I am able to pull the custom HTML pages (pages ending in HTML), just not ones ending in an SHTML extension. If I take an SHTML error file (ICMERR-EDEFAULT.shtml) and rename it to an HTML file (ICMERR-EDEFAULT.html) it works fine. I want to harness the power of dynamic HTML to capture ceratin user infomation if I can by using SHTML pages. I want to be able to use pages like this > https://help.sap.com/saphelp_nw04/helpdata/en/18/2a7c7eedb1c74b8ee0bfa8dfdc3778/content.htm
Attached you will find the 400 session timeout page that I get after timeout as well as the custom redirect page that works fine as an HTML page but not when I make it have an SHTML extension
Default >
Custom >
