SP Agent is the machine which is used to generate virtual user load. We have load test being carried in our project which is to be simulated from client environment This is to avoid the network delays as users of this app would be in client environment load should be simulated form client environment. (In fact we observed difference in response time as high as 10 sec when we compared two test run. One using offshore Agent and other using onsite Agent.) For this we got a machine in Client and we would connect to this machine through vpn. Hence this would be used as Agent while we would control execution of test from offshore. To be able to do this we got two ports 19200 and 19202 opened on this machine from client environment . Opening of these two ports got us going with performance test.