ERROR 303: hostname not recognized as belonging to an academic domain Sonja Mars December 04, 2020 16:31 Updated Follow We discuss this error and its resolution in detail in How do I resolve an "ERROR 303" from grbgetkey? Related articles How do I resolve an "ERROR 303" from grbgetkey? ERROR 405: Cannot reinstall license grbgetkey: command not found ERROR 10009: License is for 8 cores, machine has xx Communication failed