Users who install ngrok via the Microsoft Store encounter a fatal panic immediately on starting an endpoint.

What to do

• Check whether you use ngrok ngrok Agent and Libraries. 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 1h 59m it lasted.

  Anything that failed between 2026-04-28 14:29 UTC and 2026-04-28 16:28 UTC may need a replay.

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

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

Updates from ngrok 5

1. investigatingApr 28, 2026, 2:29 PM UTC

   Users who have installed the ngrok agent via the Microsoft Store on Windows are seeing fatal panics on endpoint startup on the most recent agent version. Non Windows users and Windows users installing via other channels should not be impacted.

   provider

2. identifiedApr 28, 2026, 2:30 PM UTC

   The issue has been identified and the engineering team is working on the fix.

   provider

3. identifiedApr 28, 2026, 2:44 PM UTC

   We expect a new version of the agent that resolves this issue to be available within the next hour.

   provider

4. monitoringApr 28, 2026, 3:24 PM UTC

   Agent version 3.39.1 has been released to all channels. Once approved by Microsoft, the new build will be available via the Microsoft Store.

   provider

5. resolvedApr 28, 2026, 4:28 PM UTC

   Agent version 3.39.1 is now available in the Microsoft Store.

   provider

Corrections

None so far.

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