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Outage in Retool

Front-end assets from retool-edge.com failing to load for some customers

Resolved Major
May 05, 2026 - Started 9 days ago - Lasted 3 days
Official incident page

Incident Report

Summary AI Generated

Retool experienced a major outage lasting 63.7 hours where front-end assets from retool-edge.com failed to load, preventing Retool Apps from functioning for affected users. The issue was caused by certain ISPs (including Comcast Business and Optimum) blocking the retool-edge.com domain after it was misclassified by security services. The incident was resolved when Retool worked directly with the affected ISPs to remove the domain blocks, with a temporary workaround available during the outage involving switching to public DNS resolvers like Cloudflare or Google DNS.

We are investigating errors for some users preventing Retool Apps from loading due to errors with retool-edge.com

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Latest Updates ( sorted recent to last )
RESOLVED 6 days ago - at 05/08/2026 03:38PM

All affected ISPs have confirmed that retool-edge.com is no longer being blocked. This incident is now resolved. Thank you for your patience.

MONITORING 7 days ago - at 05/08/2026 12:26AM

We are no longer receiving new reports of users being affected. We will continue to monitor this incident over the next 24 hours before marking it as resolved.

MONITORING 7 days ago - at 05/07/2026 06:47PM

We are seeing reports of some users returning to normal operation. We are continuing to work with ISPs to remove the block on retool-edge.com and will keep you posted on our progress. If you are still experiencing issues, the workaround below remains available.

IDENTIFIED 8 days ago - at 05/06/2026 08:51PM

TALOS has reclassified our domain. We have escalated directly to affected ISPs to have the block fully lifted and are actively working toward a resolution. We will provide another update once full resolution is confirmed.

IDENTIFIED 8 days ago - at 05/06/2026 04:23PM

Comcast Business SecurityEdge customers may find that the workaround mentioned does not work, and neither does allowlisting the retool-edge.com domain. In these cases, disabling SecurityEdge has been successful.

If you are still experiencing issues after trying the DNS workaround, we recommend reaching out to your IT team to check whether retool-edge.com has been added to a block list at the device profile or network level. Some filtering policies may be blocking the domain regardless of your DNS settings.

We are continuing to work with ISPs to unblock the domain and will provide updates as we have them.

IDENTIFIED 9 days ago - at 05/06/2026 01:52AM

While we work on removing the ISP blocks, here is a workaround.

You can temporarily resolve this by switching to a trusted public DNS resolver such as 1.1.1.1 (Cloudflare) or 8.8.8.8 (Google).

Mac:
1. System Settings → Network → select your connection → Details
2. Click the DNS tab
3. Add 1.1.1.1 or another trusted DNS resolver
4. Click OK

Windows 11:
1. Settings → Network & Internet → select your connection (WiFi or Ethernet)
2. Scroll down to DNS server assignment → click Edit
3. Change to Manual, toggle on IPv4, enter 1.1.1.1 or another trusted DNS resolver
4. Click Save

If you are not familiar with making these changes or your devices are managed by your organization, please reach out to your IT or infrastructure team for assistance.

We are actively working to resolve the underlying issue. We will provide updates as we have them.

IDENTIFIED 9 days ago - at 05/06/2026 12:41AM

We've identified the issue is due to certain ISPs blocking the retool-edge.com domain. Confirmed ISPs are Comcast Business and Optimum (Altice USA / Cabelvision).

We are actively working to remove the block.

INVESTIGATING 9 days ago - at 05/05/2026 11:59PM

We are investigating errors for some users preventing Retool Apps from loading due to errors with retool-edge.com

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