CSMS #47765991 - Potential MQ Channel Issues Affecting Some ACE Trading Partners U.S. Customs and Border Protection sent this bulletin at 05/12/2021 11:37 AM EDT Cargo Systems Messaging Service CSMS #47765991 - Potential MQ Channel Issues Affecting Some ACE Trading Partners CBP is aware that some ACE trading partners are currently being impacted by gateway MQ channel issues. CBP technicians are actively investigating and another CSMS will be sent when an update is available.