Network Doctor

Cross-platform TUI that diagnoses DNS, TCP, TLS, HTTP, and proxy failures and suggests fixes.

Desktopfree

Network Doctor is a cross-platform command-line diagnostic tool that checks interface, DNS, TCP, TLS, HTTP, proxy, and path-MTU connectivity to identify exactly where a network connection is failing. It replaces manually parsing ping, dig, and curl output with a plain-English diagnosis and suggested fix, and can run interactively or output JSON for scripts. It's aimed at sysadmins and developers troubleshooting network problems on Linux, macOS, or Windows.

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