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Outage in Fly.io

IPv6 networking issues on some hosts

Resolved Minor
October 17, 2025 - Started 6 months ago - Lasted 3 days
Official incident page

Incident Report

We're investigating IPv6 connectivity issues on a small number of hosts in the SJC region. Machines on impacted hosts may see inbound/outbound connectivity issues over IPv6. IPv4 connections for these hosts are not impacted.
Components affected
Fly.io SJC - Sunnyvale, California (US)

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Latest Updates ( sorted recent to last )
RESOLVED 6 months ago - at 10/21/2025 02:38AM

This incident has been resolved.

MONITORING 6 months ago - at 10/20/2025 07:08PM

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

IDENTIFIED 6 months ago - at 10/18/2025 12:17AM

We've identified the problem and confirmed that the IPv6 connectivity issues are intermittent. The problem stems from a faulty network switch in our SJC region, and we're working with our upstream provider to get it resolved.

If you're seeing issues here, please consider disabling IPv6 if you app doesn't need it, or moving Machines to a different region. This issue only affects outbound IPv6 traffic in SJC.

INVESTIGATING 6 months ago - at 10/17/2025 11:53PM

We're investigating IPv6 connectivity issues on a small number of hosts in the SJC region. Machines on impacted hosts may see inbound/outbound connectivity issues over IPv6. IPv4 connections for these hosts are not impacted.

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