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+---
+id: 9a1eef9e91
+question: How do I fix Claude Code login failing with "localhost refused to connect"
+  in GitHub Codespaces?
+sort_order: 6
+---
+
+Claude Code's OAuth login opens a browser tab pointing at `http://localhost:PORT/callback`. In GitHub Codespaces, that callback URL can fail to load because the browser reaches it through Codespaces' port-forwarding proxy instead of talking directly to the listener.
+
+Workaround:
+1. Run `claude` and let it open the login link in your browser.
+2. When the page fails to load, copy the full callback URL from the address bar (for example `http://localhost:35251/oauth/callback?code=...`).
+3. In a second terminal tab inside the same Codespace, run:
+
+```bash
+curl "http://localhost:35251/oauth/callback?code=..."
+```
+
+4. Your original `claude` terminal should log in immediately.
+
+Why this works: the `curl` runs inside the Codespace on the same machine as the listener, so it bypasses the forwarding proxy.
+
+If this still doesn't resolve it, check Anthropic's [Troubleshoot installation and login](https://code.claude.com/docs/en/troubleshoot-install) docs for other known causes.