3rd Party: Some HubSpot connections intermittently failing with "Unknown failure" error

Incident Report for Fivetran

Resolved

This incident has been resolved. We observed that HubSpot connector sync success rates have returned to normal levels, and syncs are now running as expected.

Description:
We identified an issue where some HubSpot connector syncs were failing with the error: "Unknown failure."

Timeline:
The issue began on March 17, 2026, at 17:10 UTC and was resolved at 17:26 UTC.

Cause:
The issue was caused by timeouts while attempting to reach HubSpot's OAuth endpoint.

Resolution:
No changes were required on our side. The issue was automatically resolved once connectivity to HubSpot's OAuth endpoint was restored.

Posted Mar 17, 2026 - 18:00 UTC