# MCGrowth Degradation on AUS2S, AUS4S, AUS6S, AUS14S…

- Provider: [Salesforce](https://down.guide/providers/salesforce)
- Confidence: Confirmed
- Impact: Major outage
- lasted 22h 5m
- started 2026-10-25 05:26 UTC
- MCGrowth
- aus2s, aus4s, aus6s, aus14s
- id: DWN-cee38c7adc
- Official page: https://status.salesforce.com/incidents/20004529

## Root cause
> We'll complete a full investigation to establish the technical trigger, the underlying cause, and the preventive actions to avoid a repeat.

[Postmortem](https://status.salesforce.com/incidents/20004529)

## Updates from Salesforce
### 2026-10-26 03:39 UTC: update
Affected Marketing Cloud customers are experiencing HTTP 400 errors and signature verification failures when accessing tracked email links, preventing them from reaching their intended destination URLs. We're investigating the issue and working to determine the full scope of impact.
We'll provide an update in 30 minutes or sooner if additional information becomes available.

### 2026-10-26 03:59 UTC: update
We resolved an issue that caused error messages when customers opened tracked email links in Marketing Cloud. A configuration issue in a recent deployment affected email link redirects. We rolled back the deployment in the affected region and confirmed that email links are redirecting successfully.
We apologize for the impact this incident had on our customers and their businesses. We'll complete a full investigation to establish the technical trigger, the underlying cause, and the preventive actions to avoid a repeat.

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