CSMS 59284988·System update·February 4, 2024·View on csms.cbp.gov ↗

ACE Maintenance Window Extended to troubleshoot Legacy ACE access for External Users

Plain-English explanation

CSMS 59284988 is a U.S. Customs and Border Protection (CBP) Cargo Systems Messaging Service bulletin (system update), published on February 4, 2024. It carries the official CBP guidance brokers and importers must follow for the topic — "ACE Maintenance Window Extended to troubleshoot Legacy ACE access for External Users". CSMS messages are the operational layer between Commerce determinations and at-the-border collections: when Commerce publishes a new rate, scope ruling, or instruction, CBP turns it into a CSMS that ACE/ACS systems and brokers act on.

Message body

Full text as published by U.S. Customs and Border Protection

CSMS # 59284988 - ACE Maintenance Window Extended to troubleshoot Legacy ACE access for External Users U.S. Customs and Border Protection sent this bulletin at 02/04/2024 04:44 AM EST Cargo Systems Messaging Service CSMS # 59284988 - ACE Maintenance Window Extended to troubleshoot Legacy ACE access for External Users CBP encountered a network related issue that is blocking external users from accessing Legacy ACE applications during the planned ACE maintenance deployment window. Note that this is not affecting internal CBP users, Truck Manifest Mod (TMM), or EDI processing. CBP will extend the maintenance window to continue to troubleshoot the network related issue. CBP will issue a resolved message when the issue is corrected. Update your subscriptions, modify your password or e-mail address, or stop subscriptions at any time on your Subscriber Preferences Page . You will need to use your e-mail address to log in. If you have questions or problems with the subscription service, please contact subscriberhelp.govdelivery.com . This service is provided to you at no charge by U.S. Customs and Border Protection . Privacy Policy | GovDelivery is providing this information on behalf of U.S. Department of Homeland Security, and may not use the information for any other purposes. Powered by Privacy Policy | Cookie Statement | Help

Frequently asked questions

What is CSMS 59284988?

CSMS 59284988 is a U.S. Customs and Border Protection (CBP) Cargo Systems Messaging Service bulletin titled "ACE Maintenance Window Extended to troubleshoot Legacy ACE access for External Users". CSMS bulletins are the operational instructions CBP issues to brokers, importers, and ACE filers covering rate changes, system updates, scope guidance, and other day-to-day customs-operations changes.

When was CSMS 59284988 published?

CBP published CSMS 59284988 on February 4, 2024. The bulletin's instructions are typically operative as of the publication date unless the body specifies a different effective date.

Is the CBP CSMS the legally binding instruction?

Yes — for at-the-border filing and entry collection. CSMS messages translate Commerce's Federal Register determinations into operational CBP instructions that ACE/ACS systems and brokers execute. The Federal Register notice is the underlying legal authority; the CSMS is the operational implementation. Both should be read together when reconciling a rate or scope change.

Learn more

Tandom guides relevant to CBP CSMS messages

Subscribe to and triage CBP CSMS messages

How to subscribe to CBP Cargo Systems Messaging Service and triage the messages that change broker filing behavior, without losing the ones that matter.

Open resource

Real-time alerts when a CSMS message changes a duty rate

Set up alerts when a CBP CSMS message changes a duty rate on an HTS code you depend on. Built for brokers, forwarders, and importer compliance teams.