I use OpenVPN system on my pc, and while I want to use the mpiexec it run too slowly ( e.g. takes 1min to run hello world), but when I disable the ethernet connection that corresponds to the Openvpn, mpiexec works promptly. The problem is that I cant use both my OpenVPN and mpiexec at the same time every time I have to disable it. How can I be able to stop the mpiexec to connect to the OpenVpn?