CHICAGO — McDonald’s Corp. announced all its restaurants were once again open and serving customers following a global technology system outage on March 15.

Around midnight last Friday, the company experienced the outage, which was caused by a third-party provider during a configuration change, Brian Rice, executive vice president and global chief information officer at McDonald’s, said. He noted that there was no cybersecurity event.

“Reliability and stability of our technology are a priority, and I know how frustrating it can be when there are outages,” Rice wrote to global employees, franchisees and DL partners at the time of the outage. “I understand that this impacts you, your restaurant teams and our customers. What happened today has been an exception to the norm, and we are working with absolute urgency to resolve it. Thank you for your patience, and we sincerely apologize for any inconvenience this has caused.”

Within a day, McDonald’s was able to get all its markets back online. Local technology teams were made available to continue to provide support as needed.

The company plans to analyze the issue further in the coming days, pushing for accountability across its teams and third-party vendors.