Configuring Soffid WSSO The system is configured using Apache configuration files, plus some ECMA script files that can be located anywhere you want. If you are using Ubuntu Server, it is necessary remove apache_mpm_worker module and install apache_mpm_prefork one. In general, Soffid WSSO acts intercepting and modifying any request made to Apache. This request can be processed by Apache itself or forwarded to another web or application server using ProxyPass module.