Codespaces "Oh no, it looks like you are offline" and Other Connection Errors

How to fix it

Try these in order — the most common fix is first.

1. 1. Browser fixes

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   1. Open github.com/codespaces and connect from there (you can only open codespaces you created)
   2. Try a different browser
   3. For "unable to authenticate", clear local storage and cookies
   4. For "trouble fetching", wait a few minutes and retry
   Did this fix it? Yes No

2. 2. Network and firewall

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   1. Run gh api meta --jq .domains.codespaces to list required domains and allow them
   2. Allow *.visualstudio.com on the firewall; exclude it from TLS inspection or install the firewall root CA
   Did this fix it? Yes No

3. 3. VS Code extension

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   1. Update the GitHub Codespaces extension
   2. Switch from VS Code Insiders to Stable
   Did this fix it? Yes No

4. 4. Latency

   1. Set your Codespaces region manually in user preferences
   Did this fix it? Yes No

Symptoms

Messages such as "Oh no, it looks like you are offline", "We are having trouble fetching your codespace information", "We were unable to authenticate your connection", or the VS Code extension failing to connect (connect EACCES, ECONNREFUSED, getaddrinfo ENOTFOUND, "Tunnel service HTTPS certificate is invalid").

Why it happens

• Unstable internet or a company network blocking connections
• Firewall blocking *.visualstudio.com or Codespaces domains
• TLS inspection injecting a self-signed certificate
• Authentication failure with stale local storage or cookies
• Codespace created in a region far from you (latency)

This guide also covers

• codespaces oh no it looks like you are offline
• codespaces unable to connect
• codespaces tunnel service https certificate invalid
• codespaces connection error

The same problem in other apps

All not loading, error messages & connection guides →

• Ona AWS Runner Failed: ROLLBACK_COMPLETE and ECS Circuit Breaker Errors (Gitpod)
• VS Code Python Interpreter Not Found (VS Code)
• StackBlitz "Cannot load native addon because loading addons is disabled" (StackBlitz)

Other GitHub Codespaces errors

• Codespace Running in Recovery Mode: "This codespace is currently running in recovery mode due to a container error"
• GitHub Codespaces Creation Failed
• Can't Create a Codespace: No Option to Create on the Repository
• GitHub Codespaces "503 Service Unavailable" Error
• GitHub Codespaces Port Forwarding Not Working
• Codespace Out of Storage: How to Free Disk Space
• Codespaces Included Usage Used Up: Core Hours and Storage Quota
• Codespaces Prebuild Not Working: "Prebuild Ready" Label Missing