CyrusOne has confirmed that a human error at its Aurora, Illinois data center led to a significant market outage on CME Group-operated platforms, lasting over 10 hours. The incident occurred over the weekend when on-site staff and contractors failed to properly drain cooling towers before the onset of cold weather, resulting in an overloaded cooling system and rising temperatures. The outage has raised concerns about the reliability of financial market infrastructure, as CyrusOne is jointly owned by KKR & Co. and Global Infrastructure Partners. This follows a recent suspension of commodity futures trading by CME Group on November 28, highlighting ongoing challenges in maintaining operational stability.