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Colab runtime repeatedly reconnects with ERR_HTTP2_PROTOCOL_ERROR / WebSocket 1006 #6200
Description
Describe the current behavior
A clear and concise explanation of what is currently happening.
Describe the expected behavior
A clear and concise explanation of what you expected to happen.
What web browser you are using
(Chrome, Firefox, Safari, etc.)
Additional context
Link to a minimal, public, self-contained notebook that reproduces this issue.
- Share the file using your GitHub account using File > Save a copy as a GitHub Gist.
- or Share Drive notebooks using the Share button then 'Get Shareable Link'.
- Hello Colab Team,
I have been unable to connect to Google Colab runtimes since late October 2026.
The connection repeatedly switches between “Connecting” and “Reconnect”.
Environment:
- Country: Japan
- Browser: Chrome, Edge, and Firefox
- OS: Windows
- Runtime: Both CPU and GPU
- New notebooks also fail
Troubleshooting already attempted:
- Chrome, Edge, and Firefox
- CPU and GPU runtimes
- New notebooks
- Mobile hotspot
- Changed Windows DNS to Google Public DNS, then reverted
- QUIC was already disabled
None of these solved the issue.
Chrome DevTools Console shows:
- ERR_HTTP2_PROTOCOL_ERROR
- WebSocket error
- Received error 1006
- Runtime disconnected
The WebSocket connection to the Colab runtime hostname under *.us-central1.prod.r.colab.dev repeatedly fails.
Could you please investigate this persistent connection issue?
Thank you.
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