SpaceX's Starlink satellite network was back up and running on Friday as engineers hunted for the root cause of one of its biggest international outages the night before, a rare disruption for the powerful internet system set off by an internal software failure.

Starlink, owned by Elon Musk, has changed the game in terms of internet accessibility in rural and other underserved areas lacking high-speed broadband infrastructure. It has 2 million US subscribers, and more than 6 million globally.

Starlink is owned and operated by SpaceX, which is also run by Musk. Elon Musk ’s satellite internet service Starlink said it had a “network outage” on Thursday. The company said it was working on a solution. There were more than 60,000 reports of an outage on Downdetector, a site that logs issues.