And there's no firewall blocking it? Well it render some times but once it fails to render in a scene, using mental ray, it refuses to render agains even if i start a new scene in the project. In order to render again I need to reset the Mac and delete the render log files, empty the trash bin and make a new project and then it will let me render in mental ray till I do some combination of things that Mental ray does not like, It seems to happen whenever I try use any of the mental ray Materials. It renders fine in the View port but gets stuck when I batch render. And no I checked the fire wall is off.