How do I find out which process is listening on a TCP or UDP port on Windows?

Cover Image for How do I find out which process is listening on a TCP or UDP port on Windows?
Matheus Mello
Matheus Mello
published a few days ago. updated a few hours ago

🕵️‍♀️ Unraveling the Mystery: Finding the Process Listening on a Port in Windows

You're tinkering with your Windows system, trying to troubleshoot a networking issue, when suddenly a wild question appears: "How do I find out which process is listening on a TCP or UDP port on Windows?" 😮

Fear not, fellow tech explorer! In this guide, we'll navigate through the wondrous realms of Windows and uncover the secrets to solving this elusive mystery. We'll address common issues, provide easy solutions, and empower you to conquer the port detective work with confidence. Let's dive in! 🌊

🗺️ The Origins of the Question

Before we embark on this adventure, let's understand the context better. Imagine you have an application that relies on a specific port to communicate over the network. But alas, the port seems blocked, causing frustration and perplexity! To fix it, we must sleuth our way to the process responsible for occupying that port. 🕵️‍♂️

💡 Shedding Light on the Solution

1. Command-Line Curiosity 🖥️

The battle starts in the command-line realm, where mighty commands pave the way for knowledge. Open your trusty Command Prompt or Windows PowerShell and type in the following command:

netstat -ano | findstr :<port_number>

Replace <port_number> with the actual port number you seek, like 80 or 443. Hitting Enter 🚀 will unleash a treasure trove of information, including the Process ID (PID) we're searching for!

2. Decode PID with Task Manager 📊

Armed with the PID of the culprit process, we embark on the next quest. Open the Task Manager using the beloved Ctrl + Shift + Esc shortcut or by right-clicking on the taskbar and selecting "Task Manager."

Within this fortress of processes, go to the "Details" or "Processes" tab (depending on your Windows version) and find the PID column. Locate the corresponding PID from our previous command and witness the process unveiling itself! 🧙‍♂️

3. One Process to Rule Them All 🏰

Once you've identified the rogue process, you hold the power to take appropriate action. If it's a misbehaving application, consider closing it and reopening it to release the locked port. Alternatively, you may explore reconfiguring the application to use a different port. The choice is yours, the possibilities endless! 🚪

📣 The Call to Action

Now that you possess the secret knowledge and the tools to unveil the process behind a lurking port, it's time to put it into action! Go forth, troubleshooters, help your friends and colleagues, and share this guide far and wide to spread the wisdom of port detection on Windows. Let's make networking puzzles a thing of the past! 🌟

Share your port detective stories or any other tech conundrums you'd like solved in the comments below. Remember, together we can conquer any tech challenge! 💪


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