Oil prices were headed for a fourth consecutive monthly loss early on Friday as a data center glitch forced CME Group to halt trading in futures and options, disrupting oil futures trades as well as equities, bonds, and foreign exchange. “Due to a cooling issue at CyrusOne data centers, our markets are currently halted,” CME Group, of which NYMEX is part, said in early Asian trade on Friday. “Support is working to resolve the issue in the near term and will advise clients of Pre-Open details as soon as they are available.”…