CME Data Center Outage Caused by Human Error, CyrusOne Says

An outage that took down markets operated by CME Group Inc. for more than 10 hours at the end of last week was caused by human error at a data center owned by CyrusOne.

Onsite staff and contractors at the facility in Aurora, Illinois, failed to follow standard procedures for draining cooling towers ahead of freezing temperatures, a spokesperson for CyrusOne, a company owned by KKR & Co. and Global Infrastructure Partners, said in a statement to Bloomberg News on Saturday. That resulted in the cooling system being overloaded and rising temperatures.