Comment 1 for bug 42759

I am running Firestarter 1.0.3 and the latest NetworkManager from the code repository (the NetworkManager applet says 0.6.0). I am able to start both applications at startup without any errors. What versions are you running?

As a side note, I get a similar error to "External network device eth0 is not ready" from the Firestarter GUI, but only when eth0 was not able to start due to the cable not being plugged in at startup. This occurs regardless of NetworkManager being installed or not. This makes me think that for some reason your install of NetworkManager isn't bringing up your eth0 device before Firestarter tries to begin, so Firestarter fails. This wouldn't be a problem with Firestarter, but possibly with the start time of NetworkManager on your system.