Problem with WinCC Flexible and SIMATIC MANAGER

[Cueca]

Hi, I don't speak english (only with google translate). But i am desperate to look elsewhere. I have a problem: I went through training practice and wrote a program for the panel in the program WinCC Flexible. i worked on the computer of the enterprise on VirtualBox. and when the program was written we tested it on the simulator controller SIMATIC S7-300 (SIMATIC MANAGER). All worked.
But when i finished and lost touch with the leaders, I found that on a home computer simulator is not running. I do everything the same way, but "there is no communication with the controller". I think it may a problem with the connection and ip. But I do not know how to fix this error.
Probably my text sounds funny, but in another way I can not. Help please.

[Yury]

S7-Plcsim is installed on your home computer? What is your version of the S7-Plcsim?
simulate the step7 and wincc flexible program