IPv6 Networking Issues in DFW

What to do

• Check whether you use Fly.io DFW - Dallas, Texas (US) in us. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 5h 57m it lasted.

  Anything that failed between 2026-09-23 06:18 UTC and 2026-09-23 12:15 UTC may need a replay.

• Subscribe to Fly.io's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=fly works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from Fly.io 4

1. investigatingSep 23, 2026, 6:18 AM UTC

   We are investigating IPv6 connectivity issues on a subset of hosts in DFW region. Machines on impacted hosts may see inbound/outbound connectivity issues over IPv6. IPv4 connectivity is not impacted.

   provider

2. identifiedSep 23, 2026, 6:52 AM UTC

   One of the internet transit providers upstream of the affected hosts is performing regional maintenance, which is expected to complete at 10:00AM UTC. IPv6 connectivity to and from destinations using that transit may be impacted during this time window.

   provider

3. identifiedSep 23, 2026, 10:52 AM UTC

   We are continuing to work on a fix for this issue.

   provider

4. resolvedSep 23, 2026, 12:15 PM UTC

   This incident has been resolved.

   provider

Corrections

None so far.

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