What changed at U.S. Customs?

1. Sep 24
   System MaintenanceCSMS #70011959

   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.

2. Sep 23
   System MaintenanceCSMS #70001277

   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.

3. Sep 17
   System MaintenanceCSMS #69927746

   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.

4. Sep 17
   System MaintenanceCSMS #69927747

   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.

5. Sep 15
   System MaintenanceCSMS #69913228

   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.

Allied CHB writes the summaries and positions with AI (Claude) from the published CBP message. They are general information, not legal advice. Always check the official CBP message, which each page links to.