If Process Simulator and Proxy or Application Engine reside on opposite sides of a firewall, you must take additional configuration steps on Process Simulator.
Process Simulator uses the same URL as the client to update a simulation status. Therefore, if a client accesses an IBM FileNet web application via a proxy or remote HTTP server, Process Simulator uses the same URL (including the port) to update the simulation status. If the client accesses an IBM FileNet web application directly via the application server where its deployed, Process Simulator again uses the same URL (including port) to update the simulation status.
To configure Process Simulator for use behind a firewall