Postgres DNS resolution issues

Incident Report for Ubicloud

Resolved

Cross checking DNS records has been successful for some time. Customers report negative caches have since expired. Likely cause: race condition that caused misapplication of DNS records that was exposed under higher parallelism. We have to analyze it and patch it in the coming days.
Posted Feb 06, 2026 - 22:13 UTC

Monitoring

We've identified this problem, and believe negative caching of DNS records to be all that remains. We are going to continue to check for at least thirty minutes, the longest time reported for negative caching so far.
Posted Feb 06, 2026 - 21:41 UTC

Identified

Some records are proving more difficult to address than we expected.
Posted Feb 06, 2026 - 21:35 UTC

Monitoring

We've hotfixed the remaining records. Negative caching of DNS can slow recovery, depending on the upstream DNS server. We will remain in contact with all affected customer until all symptoms are resolved.
Posted Feb 06, 2026 - 21:16 UTC

Investigating

There is a defect in Postgres that causes unbound DNS records. Negative caching can exacerbate the incident after our fix. Databases affected: many at the outset, some now. Diagnosing the last records.
Posted Feb 06, 2026 - 20:00 UTC
This incident affected: PostgreSQL.