Troubleshooting port forwarding for Codespaces

Troubleshooting steps for common port forwarding issues.

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When an application running inside a codespace outputs a port to the console, Codespaces detects the localhost URL pattern and automatically forwards the port. For more information, see "Forwarding ports in your codespace."

If a port is not automatically forwarded, you can forward it manually. For more information, see "Forwarding a port."

If port forwarding is set up, check the following:

  • Use the notification toast or click the URL in Terminal to open the forwarded port. Typing in localhost:8000 (as an example) to your local machine will not work if you're connected to the codespace via the browser.
  • Make sure to check that your application is still running from within your codespace. If your codespace has stopped after a period of inactivity, you'll need to ensure to restart your application once the codespace has restarted.

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