exposure-check

Diagnose reachability, routing, DNS, and TLS issues for a self-hosted service.

Platform

• Linux server flow: first-class
• Windows desktop flow: supported for quick local diagnostics

What this skill is for

Use this when something is supposed to be reachable but acts cursed:

• works on localhost but not LAN
• works on LAN but not public internet
• DNS resolves but the app still fails
• HTTPS warns or the fingerprint changed
• router, firewall, hoster, VPN, or bind-address choices may be sabotaging things