# Fly.io: Major incident: IPv6 Networking Issues in DFW

**Summary:** Fly.io reported a major IPv6 connectivity incident affecting a subset of hosts in DFW, starting 2026-09-23 06:18 UTC and resolved at 2026-09-23 12:15 UTC, lasting 5 h 57 min. Machines on affected hosts could experience inbound/outbound IPv6 issues; IPv4 was unaffected. Fly.io identified regional maintenance by an upstream internet transit provider. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2026-09-23 06:18 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://status.flyio.net/incidents/01M36HPZ86G87MQXEM9MA40BXN](https://status.flyio.net/incidents/01M36HPZ86G87MQXEM9MA40BXN)
- [Company: Fly.io](https://rewindex.com/company/fly-io.md)
- Versions: before (none: first archived) → after incident\_version:186/01M36HPZ86G87MQXEM9MA40BXN@cb09b0ce4342
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ IPv6 Networking Issues in DFW
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-09-23 06:18 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-09-23 12:15 UTC
```

**6. Added: Update** (investigating) · 2026-09-23 06:18 UTC

```diff
+ 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.
```

**7. Added: Update** (identified) · 2026-09-23 06:52 UTC

```diff
+ 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.
```

**8. Added: Update** (identified) · 2026-09-23 10:52 UTC

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

**9. Added: Update** (resolved) · 2026-09-23 12:15 UTC

```diff
+ This incident has been resolved.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-09-23 06:18 UTC | Major incident: IPv6 Networking Issues in DFW (this change) | degradation |

All Fly.io changes: [timeline](https://rewindex.com/company/fly-io/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


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Canonical: https://rewindex.com/change/i6b11a1a4f8781e · Markdown: https://rewindex.com/change/i6b11a1a4f8781e.md · JSON: https://rewindex.com/api/v1/changes/i6b11a1a4f8781e · Generated 2026-10-18T01:54:23.017Z