In EPM 11.1.2.3.500, FR web is deployed on Exalytics server enable the HFM thin driver by setting "UseHFMThinDriver" to “true” in jconsole (FRConfig.sh). Once enabled then restart all the services on Exalytics and HFM services on Windows.
FRConfig.sh is located under: <Middleware_Home>/EPMSystem11R1/products/financialreporting/bin