Panda Port Manager

Overview

panda-port-manager is a small Windows desktop tool (WinForms / .NET 10) that makes "who is using this port?" visible at a glance: it lists every TCP / UDP port together with the process behind it, with filtering, sorting and one-click process termination to free a port. It also detects and releases winnat system-reserved ports. A single-file exe, ready to run, with light/dark themes and a trilingual UI.

Screenshots

Dark theme (Simplified Chinese): every port and its process on one screen, with the filter and actions on the right

English UI

Highlights

• Full port overview: protocol, local / remote address and port, state, PID, process name and a first seen time column for spotting freshly created connections
• IPv4 / IPv6 dual-stack merge: the v4 and v6 listeners of the same process on one port collapse into a single row (0.0.0.0 / ::)
• Live filtering and sorting: filter by port / process name / IP / state as you type; port and PID compare numerically (10 never sorts before 9)
• End process: single or multi-select batch termination (child trees included), also via right-click or Delete / Enter; critical system processes are protected and failures are reported explicitly
• Auto refresh: manual by default, tick the box to refresh every 3 seconds while preserving the filter, sort order and selected row
• Reserved-port detection and release: ports without a process are checked against the excluded ranges from netsh; a winnat reserved range can be freed by restarting the service
• Light / dark / follow system, with the DWM title bar, list headers, dialogs and context menus all covered in dark mode
• Trilingual UI (简体中文 / 繁體中文 / English) switched instantly, or follow system
• High-DPI multi-monitor support: built on PerMonitorV2 with manual scaling, so column widths and fonts are recomputed for the new DPI instead of being clipped
• Shipped as a single exe: no registry writes, the only file on disk is %LOCALAPPDATA%\PandaPortManager\settings.json

Download & run

1. Grab the package for your architecture from Releases (win-x64 / win-x86 / win-arm64) and unzip it
2. Requires Windows 10 / 11 and the .NET 10 Desktop Runtime
3. Run PandaPortManager.exe (a UAC prompt appears on launch)

Notes

• The application manifest declares requireAdministrator: ending other users' or system processes and restarting winnat all need admin rights
• Ending a process is a hard kill on the PID (child trees included); there is no close-connection-only or graceful option
• Restarting winnat briefly interrupts WSL / Docker / NAT networking
• PIDs come from a netstat -ano subprocess, which gets slower on machines with a huge number of connections (capped at 5 seconds)