Hi,
As you are using localhost for the IP it means that the software for the Simio borad is on the same PC as the prepar...
First is to be sure the iocp4prd is loaded and running...
So, goes to the modules folder of your iocpserver. You created on the prepar3d v4 folder on Program Files\Lockhedd Martin.
Find and delete the file iopcp4p3d.log
Run Prepar3d and see if the file was created and, if yes, whats its content... you can open it with notepad.
If the LOG file is not created, try run Prepar3d as an adminstrator. Click with right button of your mouse on Prepar3d.exe and select Run as administrator
If this make iocprun, you can chage Prpear3d.exe properties to run as an adminstrator ever. Click with right button of your mouse on Prepar3d.exe and select Properties, on the dialog that appears select the tab Compatibility, and chek the 'checkbox' Run as an adminostratos ob the bottom of the dialog. Click OK and ejoy...
If the log is not created tell me...