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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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CBP held ACE maintenance window in June 2026
CBP announced an extended invasive maintenance window for ACE production from 9:00 p.m. ET on Saturday, June 20, 2026, to 4:00 a.m. ET on Sunday, June 21, 2026. This maintenance affected ACE availability during that overnight period. The message did not describe any lasting changes to ACE functionality.
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This was a routine, time-limited maintenance notice and it has already passed. It required no action from clients then or now. If clients experienced filing issues tied to that specific window, they can ask us to check the related entries.
CBP held ACE maintenance overnight on June 6-7, 2026
CBP announced invasive maintenance on the ACE production system from 10:00 p.m. ET on Saturday, June 6, 2026 to 4:00 a.m. ET on Sunday, June 7, 2026. This was a scheduled system outage window affecting ACE availability. It applied to all ACE users during that period.
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This was a routine, one-time maintenance window that has already passed. It required no action from clients then and has no bearing on entries filed now.
CBP held ACE certification maintenance window on June 3, 2026
CBP announced an ACE certification standard invasive maintenance window on June 3, 2026, from 5:00 p.m. to 8:00 p.m. ET. This was a scheduled system maintenance event affecting the ACE certification environment.
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This notice was about a past, routine maintenance window on CBP's ACE certification system and did not affect production filings. It required no action from Allied or its clients then or now.
CBP held ACE maintenance window on May 30 to May 31, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on Saturday, May 30, 2026 to 4:00 a.m. ET on Sunday, May 31, 2026. This affected system availability for ACE users during that window. The message did not name specific ACE modules or functions affected.
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This was a routine, time-limited maintenance window that has already passed. It required no action from clients at the time and has no bearing on entries filed today. Clients do not need to do anything about this notice now.
CBP held ACE test environment maintenance window on May 20, 2026
CBP announced a standard invasive maintenance window for the ACE certification (CERT) environment on May 20, 2026, from 5:00 p.m. to 8:00 p.m. ET. This affected the test system used for ACE certification, not the production filing system. The notice did not describe any impact beyond that window.
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This notice concerned a scheduled maintenance window in CBP's test environment, not the live production system Allied uses to file entries. It did not affect entries we filed for clients. Clients did not need to take any action.
CBP held ACE maintenance overnight on May 16-17, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on Saturday, May 16, 2026 to 4:00 a.m. ET on Sunday, May 17, 2026. This was a scheduled system maintenance window affecting ACE availability. The message did not specify which ACE functions were affected.
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This was a routine, time-limited maintenance window that has long since passed. It does not affect any entries we file today, and clients do not need to take any action regarding this notice.
CBP held ACE certification maintenance window on May 13, 2026
CBP announced an ACE certification standard invasive maintenance window on May 13, 2026 from 5:00 p.m. to 8:00 p.m. ET. This was a scheduled maintenance period on the ACE certification environment. The message did not describe any impact beyond the window itself.
Show Allied's positionHide Allied's position
This was a routine, time-limited maintenance notice for the ACE certification environment and the window has already passed. It required no action from clients at the time and has no bearing on current entries. Clients do not need to do anything about this notice now.
CBP held ACE maintenance overnight May 9 to 10, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on Saturday, May 9, 2026 to 4:00 a.m. ET on Sunday, May 10, 2026. This affected users of the ACE system during that window. The message did not describe which specific ACE functions were unavailable.
Show Allied's positionHide Allied's position
This was a routine, time-limited maintenance window for ACE 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 an ACE maintenance window in May 2026, now past
CBP announced an ACE certification standard invasive maintenance window on May 6, 2026, from 5:00 p.m. to 8:00 p.m. ET. This was a scheduled system maintenance event affecting the ACE platform used for entry filing. It applied to all users of the ACE system during that window.
Show Allied's positionHide Allied's position
This was a routine, one time maintenance window that has already passed. It did not require any action from clients and does not affect entries filed today. Clients do not need to do anything about this message.
CBP held ACE maintenance overnight May 2 to 3, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, May 2, 2026, to 4:00 a.m. ET Sunday, May 3, 2026. This affected filers using ACE during that window. The message did not describe which specific ACE functions were unavailable.
Show Allied's positionHide Allied's position
This was a routine, time-limited ACE maintenance window that occurred in the past and has no ongoing effect on entries we file today. Clients do not need to take any action regarding this notice now.
CBP ran ACE maintenance window on April 29, 2026 (test environment)
CBP announced an ACE certification standard invasive maintenance window scheduled for April 29, 2026, from 5:00 p.m. to 8:00 p.m. ET. This affected the ACE certification (test) environment, not the production system used for live filings.
Show Allied's positionHide Allied's position
This notice concerns a system maintenance window that has already passed and applied to the ACE test environment. It did not affect entries Allied filed for clients. Clients do not need to take any action regarding this message.
CBP held ACE maintenance overnight April 25 to 26, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on Saturday, April 25, 2026, to 4:00 a.m. ET on Sunday, April 26, 2026. This maintenance window affected ACE availability for filers during those hours. The message did not describe any specific system functions affected.
Show Allied's positionHide Allied's position
This was a routine, time-limited maintenance window that has already passed. It does not affect entries we file today, and clients do not need to take any action regarding this notice.
CBP Held ACE Maintenance Window on April 22, 2026
CBP announced an ACE Certification Standard Invasive Maintenance Window scheduled for April 22, 2026, from 5:00 pm to 8:00 pm ET. The message gave no other details about affected systems or functions.
Show Allied's positionHide Allied's position
This was a routine, time limited maintenance window for the ACE Certification test environment, not the production system used for filing entries. It required no action from clients and had no lasting effect on entries we file today. Clients do not need to do anything about this notice now.
CBP held ACE maintenance window in April 2026, now past
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, April 18, 2026, to 4:00 a.m. ET Sunday, April 19, 2026. This was a scheduled system outage affecting ACE availability during that window. The message did not describe any other impact.
Show Allied's positionHide Allied's position
This was a routine, time-limited maintenance window that has already passed. It did not require any action from clients then and has no bearing on entries filed now.
CBP held ACE maintenance window on April 15, 2026 (historical)
CBP announced an ACE certification standard invasive maintenance window on April 15, 2026, from 5:00 p.m. to 8:00 p.m. ET. The message did not describe expected system impacts. This notice is now more than 30 days old.
Show Allied's positionHide Allied's position
This was a routine, time-limited maintenance window in CBP's ACE test environment and had no lasting effect on entries we file. Clients did not need to take any action then and do not need to act now. If clients have questions about how this affected a specific filing at the time, they should contact us.
CBP held ACE maintenance window in April 2026, now past
CBP announced an ACE Production Standard invasive maintenance window from 10:00 p.m. ET on Saturday, April 11, 2026, to 4:00 a.m. ET on Sunday, April 12, 2026. This is a routine system maintenance notice with no other details provided. The window has already passed as of today.
Show Allied's positionHide Allied's position
This was a routine ACE maintenance notice and the window has already passed. It did not require any action from importers or shippers at the time, and it has no bearing on entries filed now. Clients do not need to act on this message.
CBP held ACE maintenance overnight April 4 to 5, 2026
CBP announced invasive maintenance to the ACE production standard system from 10:00 p.m. ET on April 4, 2026 to 4:00 a.m. ET on April 5, 2026. This was a scheduled overnight maintenance window. The message did not describe any specific system changes.
Show Allied's positionHide Allied's position
This was a routine overnight 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 today. Clients do not need to do anything about this notice now.
CBP held ACE test system maintenance window on April 1, 2026
CBP announced an ACE certification standard invasive maintenance window for April 1, 2026 from 5:00 p.m. to 8:00 p.m. ET. This affected the ACE certification (test) environment. The message did not describe any effect on production filing.
Show Allied's positionHide Allied's position
This was a routine maintenance window for CBP's ACE certification test environment, not the production system Allied uses to file entries. It has already passed and required no action from clients then or now. Clients do not need to do anything.
CBP held ACE system maintenance overnight on March 28-29, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, March 28, 2026, to 4:00 a.m. ET Sunday, March 29, 2026. The message did not describe what functions were affected during the window. This notice was for planning around a past system outage.
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This maintenance window has passed and does not affect entries filed today. Clients do not need to take any action regarding this notice. If a client believes an entry was affected by this outage, they should ask us to review it.
CBP held ACE maintenance window in March 2026, now past
CBP announced an ACE production standard invasive maintenance window from 10:00 p.m. ET Saturday, March 21, 2026, to 4:00 a.m. ET Sunday, March 22, 2026. This affected system availability for filers using ACE during that window. The maintenance is complete and this notice is now historical.
Show Allied's positionHide Allied's position
This was a routine, time-limited system maintenance notice from March 2026 and it has already passed. It does not affect any entries we file today. Clients do not need to take any action regarding this notice.
CBP held ACE certification maintenance window on March 18, 2026
CBP announced an ACE certification standard invasive maintenance window on March 18, 2026, from 5:00 p.m. to 8:00 p.m. ET. This was a routine system maintenance notice affecting the ACE certification environment.
Show Allied's positionHide Allied's position
This was a routine, time-limited maintenance notice for the ACE certification environment and did not require any client action. Clients did not need to do anything in response to this message.
CBP held ACE maintenance window in March 2026, now past
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, March 14, 2026 to 4:00 a.m. ET Sunday, March 15, 2026. This maintenance has already occurred. The message did not describe which specific ACE functions were affected.
Show Allied's positionHide Allied's position
This was a routine, time-limited ACE maintenance window that has already passed. It required no action from clients at the time and has no ongoing effect on entries we file now. Clients do not need to do anything about this message.
CBP held ACE maintenance window on March 11, 2026 (historical notice)
CBP announced an ACE certification standard invasive maintenance window on March 11, 2026, from 5:00 p.m. to 8:00 p.m. ET. This is a past, routine system maintenance notice with no ongoing effect. It applied to the ACE certification environment on that date only.
Show Allied's positionHide Allied's position
This was a routine ACE certification environment maintenance notice from March 2026 and has no bearing on current filings. Clients do not need to take any action regarding this notice today. If clients have questions about current ACE availability or filing issues, they should contact us directly.
CBP ran ACE maintenance overnight on March 7-8, 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, March 7, 2026, to 4:00 a.m. ET Sunday, March 8, 2026. The message did not describe which ACE functions would be affected. This was a routine, one-time system maintenance window.
Show Allied's positionHide Allied's position
This maintenance window has passed and required no action from clients at the time. It does not affect entries filed today. Clients do not need to do anything about this notice now.
CBP Held ACE Certification Maintenance Window on March 4, 2026
CBP announced an ACE certification standard invasive maintenance window on March 4, 2026, from 5:00 p.m. to 8:00 p.m. ET. The notice did not describe which ACE certification functions were affected or give further detail.
Show Allied's positionHide Allied's position
This was a routine, one time maintenance window for the ACE certification environment and has no ongoing effect on entries we file today. Clients did not need to take any action at the time and do not need to do anything now.
CBP held ACE maintenance window in late February 2026
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET on February 28, 2026 to 4:00 a.m. ET on March 1, 2026. This affected ACE availability for filers during that overnight window.
Show Allied's positionHide Allied's position
This was a routine overnight maintenance window that has already passed. It required no action from clients then and has no bearing on entries today.
CBP held ACE certification test system maintenance in February 2026
CBP announced a scheduled maintenance window for the ACE certification standard invasive environment on February 25, 2026, from 5:00 p.m. to 8:00 p.m. ET. The message did not describe any effect on production ACE filings.
Show Allied's positionHide Allied's position
This notice covered a test environment maintenance window and did not affect entries we file for clients. It required no action from importers or shippers at the time and has no bearing on current entries.
CBP held ACE maintenance window in February 2026, now past
CBP announced a scheduled ACE Production Standard invasive maintenance from 10:00 p.m. ET on Saturday, February 21, 2026 to 4:00 a.m. ET on Sunday, February 22, 2026. This was a routine system maintenance notice with no other details provided. The window has since passed.
Show Allied's positionHide Allied's position
This was a routine, time-limited maintenance window that has already passed. It did not require any action from clients at the time and has no bearing on entries filed today.
CBP held ACE test system maintenance on February 18, 2026
CBP announced a maintenance window for the ACE Certification (test) environment on February 18, 2026, from 5:00 pm to 8:00 pm ET. This was an invasive maintenance window, meaning the test system was unavailable during that time. The notice did not affect the live ACE production system.
Show Allied's positionHide Allied's position
This notice concerned the ACE test environment only, not the production system Allied uses to file live entries. It is now well past the maintenance window, so it has no ongoing effect. Clients did not need to take any action then and do not need to now.
CBP held ACE maintenance on February 7-8, 2026 (historical notice)
CBP announced ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, February 7, 2026 to 4:00 a.m. ET Sunday, February 8, 2026. This affected system availability for filers using ACE during that window. The notice did not describe further impacts beyond the maintenance schedule.
Show Allied's positionHide Allied's position
This was a routine, time limited ACE maintenance window that has already passed. It did not require any action from clients then and has no bearing on entries filed today. Clients do not need to do anything about this notice now.
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