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What changed at U.S. Customs?
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 window overnight October 17 to 18, 2026
CBP announced a standard invasive maintenance window for ACE Production. It runs from 10:00 p.m. ET on Saturday, October 17, 2026, to 4:00 a.m. ET on Sunday, October 18, 2026.
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ACE may be unavailable during this window, so we plan filings around it. Clients do not need to act.
ACE certification environment maintenance on October 14, 2026, 5:00 to 8:00 pm ET
CBP announced an invasive maintenance window for the ACE Certification Standard environment. The window runs on October 14, 2026, from 5:00 pm to 8:00 pm ET.
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This maintenance affects the ACE certification (test) environment, not live filings, so we expect no effect on client entries. Clients do not need to act.
ACE Certification environment down for extended maintenance on October 17, 2026
CBP announced an out of cycle extended invasive maintenance window for the ACE Certification environment. The window runs on October 17, 2026, from 8:00 a.m. to 9:00 p.m. ET.
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This maintenance affects the ACE Certification (test) environment, not the production system we use to file entries. Clients do not need to act.
ACE maintenance on October 8, 2026 from 5:00 to 7:00 a.m. ET may delay responses
CBP announced standard invasive maintenance on ACE Production from 5:00 a.m. to 7:00 a.m. ET on Thursday, October 8, 2026. During this window, filers may see delays in receiving response notifications.
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We expect possible delays in ACE responses for filings sent during this two-hour window. Clients do not need to act.
ACE scheduled maintenance overnight October 10 to 11, 2026
CBP announced an ACE Production standard invasive maintenance window. It runs from 10:00 p.m. ET Saturday, October 10, 2026, to 4:00 a.m. ET Sunday, October 11, 2026.
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ACE may be unavailable during this window, so filings we submit then may be delayed until it ends. Clients do not need to act, but should tell us early about any shipments arriving that night.
ACE certification environment maintenance on October 7, 2026, 5:00 to 8:00 p.m. ET
CBP announced an invasive maintenance window for the ACE certification standard environment. It runs on October 7, 2026, from 5:00 p.m. to 8:00 p.m. ET.
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This maintenance affects the ACE certification (test) environment, not live filings. Clients do not need to act.
ACE scheduled maintenance overnight October 3 to October 4, 2026
CBP announced ACE Production Standard Invasive Maintenance. It runs from 10:00 p.m. ET Saturday, October 3, 2026, to 4:00 a.m. ET Sunday, October 4, 2026.
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ACE may be unavailable during this window, so we plan filings around it. Clients do not need to act.
ACE Certification test environment down for maintenance on September 30
CBP will run an extended maintenance window for the ACE Certification environment on September 30, 2026. The window runs from 5:00 p.m. to 9:00 p.m. ET. The Certification environment is used for testing, not for live filings.
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This maintenance affects only the ACE test environment, not the live entries we file for clients. Clients do not need to act.
ACE production maintenance on September 26 to 27, 2026
CBP scheduled standard invasive maintenance on the ACE production environment. It runs from 10:00 p.m. ET Saturday, September 26, 2026 to 4:00 a.m. ET Sunday, September 27, 2026.
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We plan urgent filings outside this window. Clients do not need to act.
ACE certification environment maintenance on September 23, 2026
CBP scheduled standard invasive maintenance on the ACE certification environment. The window runs from 5:00 p.m. to 8:00 p.m. ET on September 23, 2026.
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The certification environment is for tests, not for live filings, so this window does not affect the entries we file. Clients do not need to act.
ACE production maintenance on September 19 to 20, 2026
CBP scheduled standard invasive maintenance on the ACE production environment. It runs from 10:00 p.m. ET Saturday, September 19, 2026 to 4:00 a.m. ET Sunday, September 20, 2026.
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We plan urgent filings outside this window. Clients do not need to act.
ACE production maintenance on September 19 to 20, 2026
CBP scheduled standard invasive maintenance on the ACE production environment. It runs from 10:00 p.m. ET Saturday, September 19, 2026 to 4:00 a.m. ET Sunday, September 20, 2026.
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We plan urgent filings outside this window. Clients do not need to act.
ACE certification environment maintenance on September 16, 2026
CBP scheduled standard invasive maintenance on the ACE certification environment. The window runs from 5:00 p.m. to 8:00 p.m. ET on September 16, 2026.
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The certification environment is for tests, not for live filings, so this window does not affect the entries we file. Clients do not need to act.
CBP held ACE maintenance window on September 12-13, 2026
CBP announced an ACE Production Standard Invasive Maintenance window from 10:00 p.m. ET on Saturday, September 12, 2026, to 4:00 a.m. ET on Sunday, September 13, 2026. The message did not describe which ACE functions were affected. This notice applied to filers and other ACE users during that maintenance period.
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This was a routine, one-time maintenance window that has already passed. It does not affect entries filed today, and clients do not need to take any action regarding this notice.
CBP held ACE maintenance overnight on August 29-30, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, August 29, 2026 to 4:00 a.m. ET Sunday, August 30, 2026. This affected system access for filers using ACE during that window.
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This was a routine overnight maintenance window that has already passed. It did not require any action from clients, and any related delays would have been temporary and limited to that period.
CBP held ACE test system maintenance on August 26, 2026
CBP announced an invasive maintenance window for the ACE certification (test) environment on August 26, 2026, from 5:00 p.m. to 8:00 p.m. ET. This was a scheduled maintenance notice, not a change to the production ACE system.
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This maintenance affected only the ACE certification test environment, not live filings. It has no bearing on entries we file for clients today. Clients do not need to take any action regarding this notice.
CBP held ACE maintenance window in August 2026, now past
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on August 22, 2026 to 4:00 a.m. ET on August 23, 2026. This affected ACE availability for filers during that window. The maintenance date has passed.
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This was a routine ACE maintenance window that occurred over a single overnight period in August 2026. It required no action from clients then and requires none now. Clients with questions about entries filed around that time should ask us to review them.
CBP held ACE certification test environment maintenance on August 19, 2026
CBP announced an ACE certification standard invasive maintenance window on August 19, 2026, from 5:00 p.m. to 8:00 p.m. ET. This affected the ACE certification (test) environment used for system testing, not the production filing system. The message did not name any specific transactions or services affected.
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This notice concerned a scheduled maintenance window in CBP's ACE test environment and did not affect entries we filed for clients. The window has passed and had no lasting effect on current filings. Clients do not need to do anything about this notice.
CBP held ACE maintenance overnight on August 15-16, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on Saturday, August 15, 2026 to 4:00 a.m. ET on Sunday, August 16, 2026. The notice affected users of the ACE system during that window. It did not describe any change to filing rules or requirements.
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This was a routine system maintenance notice and it has already passed. It did not change any filing requirements, so clients do not need to act. If clients had questions about entries filed around that maintenance window, they can ask Allied to check the status.
CBP held ACE certification maintenance window on August 12, 2026
CBP announced an ACE certification standard invasive maintenance window on August 12, 2026, from 5:00 p.m. ET to 8:00 p.m. ET. This affected the ACE certification environment used for testing, not production filings. The message did not name any affected filers or entry types.
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This notice concerned a test environment maintenance window that has already passed. It did not require any action from clients then and has no bearing on entries we file now. Clients do not need to do anything about this message.
CBP held ACE maintenance window in August, now past
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on August 8, 2026 to 4:00 a.m. ET on August 9, 2026. The message did not describe any effect on filings beyond the maintenance window itself. This notice is now more than 30 days old.
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This was a routine ACE maintenance window that has already passed. It did not require any action from clients at the time and has no ongoing effect on entries we file. Clients do not need to do anything about this notice now.
CBP held ACE maintenance window August 1 to 2, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, August 1, 2026 to 4:00 a.m. ET Sunday, August 2, 2026. This was a scheduled system maintenance window that could affect ACE availability during that period.
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This was a routine, time limited ACE maintenance window that has already passed. It required no action from clients then or now, and it has no bearing on current entries.
CBP held ACE certification maintenance window on July 29, 2026
CBP announced a standard invasive maintenance window for the ACE Certification environment on July 29, 2026, from 5:00 p.m. to 8:00 p.m. ET. The message did not describe any effect on production ACE filings. This is now a past, routine maintenance event.
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This notice concerned a certification test environment, not production filing, so it did not affect entries we filed for clients. No client action was needed at the time, and none is needed now.
CBP held ACE maintenance window in late July 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on Saturday, July 25, 2026 to 4:00 a.m. ET on Sunday, July 26, 2026. This affected ACE availability for filers during that window.
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This was a routine, time limited maintenance window that has already passed. It does not affect entries filed today, and clients do not need to take any action.
CBP held ACE certification maintenance window on July 22, 2026
CBP announced an extended invasive maintenance window for the ACE certification environment on July 22, 2026, from 5:00 p.m. to 10:00 p.m. ET. The message did not describe any impact on production ACE filings. This notice is now historical.
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This affected only the ACE certification (test) environment, not production filings. It did not require action from Allied or our clients then or now. Clients do not need to do anything about this notice.
CBP held ACE maintenance window in July 2026, now past
CBP announced an ACE Production Standard invasive maintenance window from 10:00 p.m. ET on July 18, 2026 to 4:00 a.m. ET on July 19, 2026. This is a historical notice about a system outage that has already occurred. The message did not describe any lasting rule change.
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This was a routine, one time maintenance window that has already passed. It did not change any filing requirement, so it has no ongoing effect on entries we file. Clients do not need to take any action regarding this notice.
CBP ran ACE maintenance window on July 15, 2026
CBP announced an ACE certification standard invasive maintenance window on July 15, 2026, from 5:00 p.m. to 8:00 p.m. ET. This was a scheduled system maintenance event on the ACE certification environment. The message did not describe effects on production filings.
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This was a routine maintenance notice for the ACE certification environment and the window has passed. It required no action from clients then or now.
CBP Held ACE Maintenance Window in July 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on Saturday, July 11, 2026, to 4:00 a.m. ET on Sunday, July 12, 2026. This affected system availability for ACE users during that window. This is a historical, dated notice and the maintenance period has already passed.
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This was a routine, time-limited maintenance window that has already occurred and does not affect current filings. Clients did not need to take any action then or now. If clients experienced issues with entries filed around that window, they should contact Allied to review the specific entry.
CBP held an ACE test environment maintenance window on July 1, 2026
CBP announced a maintenance window for the ACE certification (test) environment on July 1, 2026, from 5:00 p.m. to 8:00 p.m. ET. The message did not describe any impact on the production ACE system used for filing entries. This was a routine, time limited maintenance notice.
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This notice concerned a test environment, not the production system we use to file entries. It had no effect on entries we filed for clients and required no action from importers or shippers. Clients do not need to do anything about this notice now.
CBP held ACE maintenance window in late June 2026
CBP announced invasive maintenance on the ACE production system from 10:00 p.m. ET Saturday, June 27, 2026 to 4:00 a.m. ET Sunday, June 28, 2026. This was a scheduled system outage window affecting ACE availability. The message did not describe any lasting change to filing requirements.
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This was a routine, time-limited 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 notice.
The summaries and positions are general information, not legal advice. Always check the official CBP message, which each page links to.
Does a change affect your entries?
Call (908) 291-8001 or email info@alliedchb.com