The Notice
CBSA published TCC26-0093 last week: eManifest Portal maintenance Saturday May 9, 2026 from 06:00–07:00 ET and Sunday May 10 from 06:00–07:00 ET. Users may experience forced re-logon during those windows. The notice says you can still create and submit all trade documents and update user accesses. That's the part worth unpacking, because "forced re-logon" and "full functionality" don't usually sit in the same sentence.
If you're a carrier filing ACI (Advance Commercial Information) or a broker submitting cargo control documents through the Portal during those two one-hour windows, expect to be kicked out mid-session and asked to log back in. The Portal itself stays up. EDI transmission is unaffected. This is strictly a web-session interruption, not a system-wide outage.
What Stays Live
EDI channels for ACI and eHBL/eHWB submissions run independently of the Portal login layer. If your TMS or WMS pushes pre-arrival data via EDI, you won't notice the maintenance window. The CBSA eManifest system continues to accept and process inbound cargo records on its usual schedule.
The Portal is the fallback for carriers and freight forwarders who don't have EDI connectivity or need to manually correct a rejected transmission. During the two one-hour windows, you can still log in, create documents, submit them, and manage user permissions. You just might have to re-authenticate partway through if your session times out or the system forces a refresh.
That's different from the maintenance windows we saw in early CARM rollout, where the CARM Client Portal went fully dark and brokers couldn't file CADs for hours. This one is narrower and doesn't touch the core Pre-Arrival Review System (PARS) or Release on Minimum Documentation (RMD) queues.
The Operational Window
Most weekend commercial traffic at land borders peaks Saturday morning, tapers by mid-afternoon, and stays quiet until Sunday evening when the Monday morning rush builds. The 06:00–07:00 ET maintenance slots sit before the Saturday surge and well ahead of the Sunday evening push.
If you're a carrier with trucks crossing Saturday or Sunday morning, file your ACI the night before. The one-hour re-logon window won't matter if your cargo control record is already in CBSA's system and cleared for PARS release. If you're filing morning-of and hit the maintenance window, you lose ten to fifteen minutes re-authenticating and re-entering data. That's enough to miss a broker's morning batch filing cutoff, which can push release from Saturday afternoon to Monday morning.
For air cargo, the Friday night red-eye arrivals into Toronto and Montreal typically clear by Saturday mid-morning. If your customs broker needs to correct an ACI discrepancy or file a late house bill supplement Saturday at 06:30 ET, they'll hit the forced re-logon. It's annoying, not blocking, but it adds fifteen minutes to a process that's usually two minutes.
Contingency Language
The notice includes the phrase "refer to the contingency procedures to follow during a…" and then cuts off. That's CBSA's standard template language. The contingency procedures for eManifest Portal unavailability are spelled out in D3-1-1, the eManifest policy memo. If the Portal goes fully offline (which this notice says it won't), carriers revert to paper documentation at primary inspection and brokers file CADs manually via the CARM Client Portal once cargo is released on minimum documentation.
That fallback doesn't apply here. The Portal stays up. You just get bounced out of your session briefly. If you're mid-submission when the forced re-logon hits, your unsaved work disappears. Save your draft before 06:00 ET on both days, or finish the submission after 07:00 ET.
Where This Matters for Brokers
Most brokers don't touch the eManifest Portal. We receive cargo control data from the carrier, match it to our client's commercial invoice and packing list, classify the goods, calculate duties and GST, and file the CAD through the CARM Client Portal or our own EDI channel. The eManifest side is the carrier's job.
The exception is when a carrier's ACI submission is incomplete or incorrect and we need to file a correction or supplemental house bill to get the shipment into PARS. That happens maybe five percent of the time, usually on LTL consolidations or air freight where the house bill details don't match the master bill. If we're filing that correction during the maintenance window, we lose a few minutes. If the shipment is time-sensitive (think perishable CFIA cargo or a just-in-time automotive part), those few minutes matter.
For clients using our freight services and moving goods through our Montreal facility, the practical floor is this: if your trucker is crossing Saturday morning and we don't have clean ACI by Friday close of business, expect a Monday release. The one-hour Saturday morning maintenance window is enough friction that we don't file Saturday morning as standard practice unless the cargo is already en route and the ACI is 90% clean.
CARM Client Portal: Not Affected
CBSA's notice is specific to the eManifest Portal. The CARM Client Portal, where brokers file Commercial Accounting Declarations and manage Release Prior to Payment (RPP) bonds, is not mentioned. We assume it stays fully operational through the weekend.
That matters because the CAD filing deadline is tied to cargo release, not calendar date. If a shipment releases Saturday under PARS or RMD, the CAD is due within five business days. The maintenance window doesn't extend that deadline. If you're a broker working a Saturday release and you need to file the CAD same-day to clear a client's tight RPP bond margin, you can. The CARM side is untouched.
What to Do
If you're a carrier filing ACI manually through the eManifest Portal, avoid the 06:00–07:00 ET windows on May 9 and May 10. File Friday night or wait until after 07:00 ET. If you're already EDI-enabled, you won't notice anything.
If you're an importer waiting on a weekend release and your broker mentions a delay Saturday morning, this maintenance window is a possible contributor. It's not an excuse for a multi-day holdup, but it's a reasonable explanation for a couple of hours.
If you're a broker filing corrections or late house bills through the Portal, block the 06:00–07:00 ET windows on your calendar and tell your operations team. Save drafts before the window opens. Finish submissions after it closes.
Most of the time, scheduled maintenance is invisible. This one probably will be too. But if you're the carrier or broker caught mid-submission at 06:15 ET on a Saturday morning, fifteen minutes feels longer than it is. We file ACI corrections and supplemental house bills every week. If your weekend cargo depends on clean pre-arrival data and you're not sure your carrier has it covered, get in touch.
Originally published at https://www.canflow-global.com/en/insights/emanifest-portal-maintenance-may-910-what-actually-stops-and-what-doesnt/.
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