EADDRINUSE: address already in use :::3000. Every developer knows the feeling. You go to spin up a local server, a database container, or an AI gateway, and Windows tells you the port is already taken. Task Manager is blind to it, and digging through `netstat -ano` and `taskkill` in PowerShell yanks you out of your flow every time. **Port Detective Pro fixes that — and then makes sure it stays fixed.** This is the complete edition: every feature is unlocked the moment you install. One purchase, yours forever. No subscription, no in-app upsells, no license keys to babysit — it runs fully offline. Unlike the web-wrapper utilities out there, Port Detective is a native Windows app built entirely in Rust. You get zero-lag visibility into your whole TCP/UDP stack while it sits quietly in the background, typically holding under 50 MB of memory and easy on your CPU. **See what's really going on** Live tracking of every active TCP and UDP connection, across IPv4 and IPv6, updating in real time. Type a port like `5432` and jump straight to the process that owns it — name, PID, executable path, and connection state. The table stays smooth even when there are thousands of connections, and you can group by process, save filter presets, pin your favorite dev ports, and move through all of it from a `Ctrl+K` command palette. **Take action without second-guessing** Kill a rogue Node process or a crashed server in one click. Port Detective verifies a secure process token before it acts, so you never terminate the wrong app — even if Windows recycles the PID a half-second later. The UI is privilege-aware too: it tells you plainly when something is a protected OS process instead of leaving you wondering why it won't budge. Need to script it? Copy any row as a ready-to-run `netstat`, `taskkill`, or PowerShell command. **Port Guard keeps your ports yours** Pin the ports that matter — 3000, 8080, 1433 — and close the window. Port Guard's native Rust daemon stays in your system tray and checks your watched ports every 250 milliseconds. The moment something that shouldn't be there grabs one, you get a native Windows notification. Set up a rule and Port Guard can go further: automatically shut down the intruder, relaunch the process that's supposed to own that port, and confirm it rebound. It's a watchdog with its own crash recovery, so it keeps working even if something goes sideways. **Reach past the local machine** Scan remote VMs, Docker bridges, and servers across your network using port presets or your own ranges. When Docker is running, Port Detective maps host ports straight back to the container and image that published them, so a mystery port stops being a mystery. **Built for the way you actually work** Inspect a process and see its parent/child lineage. Watch a live timeline of ports opening, closing, and changing owner, then export it to CSV or JSON. Leave yourself notes on a port (":5432 = staging Postgres") that are searchable and can be backed up and restored across machines. And when you need an audit trail, export your full network state — notes included — to CSV or JSON. **Private by design** Core features make no external network calls, the app ships signed, and you can watch its own memory and CPU footprint right inside the app. Your data stays on your machine. Stop wrestling with the command line. Buy Port Detective Pro once and take back control of your ports.