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Every message from the CBP Cargo Systems Messaging Service (CSMS), with a plain-English summary and Allied CHB's position. We add new messages every hour.
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ACE production maintenance scheduled overnight January 31 to February 1, 2026
CBP announced standard invasive maintenance on the ACE production system. The window ran from 10:00 p.m. ET Saturday, January 31, 2026, to 4:00 a.m. ET Sunday, February 1, 2026.
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This was a routine overnight maintenance window that has already passed. Clients did not need to act then and do not need to act now.
CBP held a brief maintenance window for the ACE certification test environment
CBP announced an invasive maintenance window for the ACE Certification environment, scheduled from 5:00 p.m. to 8:00 p.m. ET. The message did not describe the maintenance date consistently, so filers should treat the notice as stating a window in that time period. This affected the ACE certification (test) environment, not necessarily live production filing.
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This notice concerned a maintenance window for the ACE certification environment, which relates to system testing rather than day to day entry filing. It did not require any action from importers or shippers, and it is long past. Clients do not need to do anything about this notice now.
CBP held ACE maintenance window in late January 2026
CBP announced a scheduled ACE Production Standard Invasive maintenance window from 10:00 p.m. ET on Saturday, January 24, 2026, to 4:00 a.m. ET on Sunday, January 25, 2026. This was a routine system maintenance notice with no other details provided. It affected ACE availability during that window only.
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This was a routine, time-limited ACE maintenance window that has long since passed. It did not change any filing rules or deadlines, and clients do not need to take any action regarding this notice now.
CBP held ACE maintenance window on January 21, 2026 (history)
CBP announced an ACE Certification Standard invasive maintenance window on January 21, 2026, from 5:00 pm to 8:00 pm ET. This was a routine system maintenance notice affecting the ACE Certification environment. The message did not describe any lasting change to filing rules.
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This was a routine, time-limited maintenance window in the ACE Certification test environment and has no ongoing effect on entries we file today. Clients did not need to take any action then, and no action is needed now regarding this notice.
ACE production maintenance window on the night of January 17, 2026
CBP announced standard invasive maintenance on the ACE production environment. The window ran from 10:00 p.m. ET Saturday, January 17, 2026, to 4:00 a.m. ET Sunday, January 18, 2026.
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This was a routine maintenance window that has already passed. Clients did not need to act, and no action is needed now.
CBP held ACE maintenance window on January 14, 2026 (historical)
CBP announced an ACE certification standard invasive maintenance window on January 14, 2026, from 5:00 p.m. to 8:00 p.m. ET. This is a routine system maintenance notice with no other details provided. The window has long since passed.
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This was a routine, time-limited maintenance notice for ACE that occurred in January 2026. It had no lasting effect on entries and does not apply today. Clients do not need to take any action regarding this notice.
CBP held ACE system maintenance in January 2026, now history
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on Saturday, January 10, 2026, to 4:00 a.m. ET on Sunday, January 11, 2026. This was a routine system maintenance window affecting ACE availability during those hours. The message did not name any specific ACE functions affected.
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This maintenance window is long past and had no lasting effect on entries. Clients do not need to take any action regarding this notice. If clients had filing issues during that specific window in January, they should ask Allied for details on how it was handled.
CBP held a short maintenance window for the ACE certification test system in early 2026
CBP announced an invasive maintenance window for the ACE certification standard environment, scheduled from 5:00 p.m. to 8:00 p.m. ET on January 7. This affected the test environment used to certify filing software, not the production ACE system used for live entries.
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This notice concerned the ACE certification test environment that brokers use to test filing software, not live entry filing. It did not affect entries we filed for clients at the time, and it has no bearing on entries now. Clients did not need to take any action.
CBP held ACE maintenance window in December 2025
CBP announced a scheduled ACE Production Standard Invasive Maintenance window from 10:00 p.m. ET on Saturday, December 20, 2025, to 4:00 a.m. ET on Sunday, December 21, 2025. This maintenance affected ACE system availability during that overnight period.
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This was a routine, time-limited maintenance notice and has already passed. It required no action from clients at the time and has no ongoing effect on entries we file today.
CBP held ACE maintenance window in December 2025
CBP announced a scheduled ACE Production Standard Invasive Maintenance window from 10:00 p.m. ET on Saturday, December 13, 2025, to 4:00 a.m. ET on Sunday, December 14, 2025. This is a past, routine system maintenance notice. It affected ACE availability during that overnight window only.
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This was a routine, time-limited ACE maintenance window that has already passed. It required no action from clients then and has no bearing on entries filed today. Clients do not need to do anything in response to this message now.
CBP held a test-system maintenance window in December 2025
CBP announced an ACE Certification Standard invasive maintenance window on December 10, 2025, from 5:00 pm to 8:00 pm ET. This affected the ACE certification (test) environment, not the live production system. The message gave no other details.
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This was a routine maintenance notice for CBP's test environment and is now history. It did not affect entries we filed for clients at the time, and no client action was needed then or now.
CBP held ACE maintenance window in December 2025 (historical notice)
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, December 6, 2025, to 4:00 a.m. ET Sunday, December 7, 2025. This was a system maintenance window affecting ACE availability during those hours. The message did not describe any other changes or requirements.
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This was a routine ACE maintenance window that has already passed. It did not change any filing rules, and clients do not need to take any action regarding this notice now. If clients have questions about entries filed around that maintenance window, they should ask Allied to review them.
CBP held a 3-hour ACE test maintenance window on Dec 3, 2025
CBP announced an ACE Certification (test) environment maintenance window on December 3, 2025, from 5:00 p.m. to 8:00 p.m. ET. This was a standard invasive maintenance window, not a production system outage.
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This message concerned CBP's test environment and did not affect production filings. It is now history and required no action from clients at the time or since.
The summaries and positions are general information, not legal advice. Always check the official CBP message, which each page links to.
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