Outage in Fivetran

Fivetran: Multiple PostgreSQL connections failing with "Unknown failure: Unhandled classified exception" due to an issue with JsonB binary decoding

Resolved Minor
August 21, 2025 - Started about 2 months ago - Lasted about 3 hours
Official incident page

Incident Report

The issue has been identified and we are working to resolve it.
Components affected
Fivetran Google Cloud PostgreSQL Fivetran Heroku PostgreSQL Fivetran PostgreSQL Fivetran Azure PostgreSQL Database Fivetran PostgreSQL RDS Fivetran Aurora PostgreSQL

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Latest Updates ( sorted recent to last )
RESOLVED about 2 months ago - at 08/21/2025 10:46PM

This incident has been resolved.


Incident Summary

Description:
Some PostgreSQL connectors failed due to a problem with JsonB binary decoding.

Timeline:
This issue began on 21 Aug 2025 at 4:00 PM UTC and was resolved at 8:30  PM UTC.

Cause:
An issue with JsonB binary decoding caused PostgreSQL connections to start failing.

Resolution:
Engineering implemented a hotfix, which restored normal operations.

MONITORING about 2 months ago - at 08/21/2025 09:12PM

A fix has been implemented and we are monitoring the results.

IDENTIFIED about 2 months ago - at 08/21/2025 08:10PM

Engineering has identified the issue as being caused by a problem with JsonB binary decoding, and are working to resolve it.

IDENTIFIED about 2 months ago - at 08/21/2025 08:05PM

The issue has been identified and we are working to resolve it.

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