The process of registering EPM System web server as a partner application (see Registering EPM System Web Server as a Partner Application) creates an obfuscated osso.conf in the location identified by the -config_file directive.
To relocate osso.conf:
Locate the osso.conf that was created when you registered EPM System web server as a partner application (see Registering EPM System Web Server as a Partner Application.
Copy osso.conf into the directory (on Oracle HTTP Server that front-ends the OSSO Server) identified by the OssoConifgFile property defined in mod_osso.conf (see Creating mod_osso.conf).