Try a couple things. First, make sure the ethernet cable at the g100 is connecting well. I push it in firmly, an sometimes give it a little jiggle. If you see the RUN light on, it is working fine. If it still won't connect, unplug the power chord to the G100, and plug it back in, and wait for the RUN light to come back on. Then shut down Mach and restart that. I'm not sure why, but this little ritual seems to help me. Let Mach work for a minute or two to try connecting. It should connect in just a little bit. Once it connects, it connects good and stays that way.