Colab VM DNS fails to resolve fresh trycloudflare hostnames (Name or service not known) while the tunnel itself works from any real browser. Verification now: 1) diagnoses VM DNS via socket.gethostbyname, 2) uses urllib when DNS resolves, 3) falls back to curl --doh-url (Cloudflare DNS over HTTPS) to bypass the VM resolver, 4) otherwise prints the docs URL with an explicit note that a minted URL means the tunnel is already connected. Troubleshooting section documents the DNS limitation.
lukehemmin
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