ACE Certification Environment Maintenance Window: August 26, 2026, 5:00–8:00 p.m. ET
CBP has scheduled a standard invasive maintenance window for the ACE Certification environment on August 26, 2026 from 5:00 p.m. to 8:00 p.m. ET; the Certification environment will be unavailable during this period. Trade partners conducting certification testing should plan around this outage.
This affects only the Certification/test environment, not ACE Production, so live entry processing is unaffected. However, clients or vendors in the middle of certification testing for upcoming releases — including the rail manifest update — should schedule their work outside this window.
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