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Lapse in Federal Funding Impact on CBP Website Operations Notice

NOTICE: Due to the lapse in federal funding, this website will not be actively managed. This website was last updated on December 21, 2018 and will not be updated until after funding is enacted. As such, information on this website may not be up to date. Transactions submitted via this website might not be processed and we will not be able to respond to inquiries until after appropriations are enacted.


Aviso del impacto de la interrupción de fondos federales en las operaciones del sitio web del Oficina de Aduanas y Protección Fronteriza de los Estados Unidos (CBP, por sus siglas en inglés)

AVISO:  A causa de la interrupción de fondos federales, este sitio de web no será administrado activamente. La última actualización a este sitio web se realizó el 21 de diciembre de 2018 y no se harán más actualizaciones hasta que el gobierno reanude operaciones; por ende, puede que el sitio web no refleje la información más reciente. Es posible que no podamos procesar transacciones ni responder a
preguntas hasta que se reanuden operaciones.

Technical Documentation for All CBP Automated Systems

These pages linked below provide the message formats and technical specifications necessary to electronically transmit data to CBP's automated systems, along with scheduled system outages that affect testing of software.

ACE Technical Documentation

Import Manifest
Entry / Entry Summary

Legacy System Documentation

These links contain detailed requirements for filing information to legacy systems including Automated Commercial System (ACS) and Automated Broker Interface (ABI) CATAIR technical requirements.

ACE Outage Schedules

There are two ACE environments available to the trade – Certification (CERT) and Production.

  • The production environment is the day-to-day live ACE environment used to process import and export submissions.

  • The certification environment is for trade users to test ACE capabilities prior to filing in the production environment. 

Both environments are subject to both planned and unplanned outages.  Planned outages are scheduled to conduct routine maintenance, while unplanned outages are to address critical system issues.  Outages to the ACE Certification environment only impact parties testing software.

Environment Outage Window(s)
Certification As Needed during non-business hours
(i.e. from 5:30 PM – 8:30 AM)
  • Tuesday 5 AM – 7 AM – outage should be no more than 30 minutes
  • Thursday 5 AM – 7 AM – outage should be no more than 30 minutes
  • Saturday 10 PM – Sunday 4 AM – used for outages expected to be more than 30 minutes

System outages are announced through the Cargo Systems Messaging Service.  To subscribe, please visit the CSMS subscription page

Last modified: 
May 24, 2018