Hi,
Can you check if /UI2/ is available in ICF node (tcode SICF)?
Troubleshooting: http://help.sap.com/saphelp_uiaddon10/helpdata/en/ca/4db2e40e354b368bf2824d5831d244/frameset.htm
Refer link: Activating SAP Gateway OData Services - User Interface Add-On for SAP NetWeaver - SAP Library and activate the services listed in the link.
hope it helps.
Thanks,
Vinod