ProcNetBlocker: Instantly Block Any Windows App From Accessing the Internet

Ever noticed an application quietly talking to the internet when it absolutely shouldn’t? Maybe a small utility phoning home without permission, a piece of software pushing telemetry in the background, or an app you simply want to force into offline mode—without cutting your entire internet connection.

This is exactly where most users end up wrestling with the Windows Firewall’s confusing interface, digging through nested menus just to block a single executable.

Thankfully, there’s now a much cleaner solution.

ProcNetBlocker is a lightweight command-line tool that lets you instantly cut off any Windows process from the network—no complex firewall rules, no guesswork, and no GUI headaches. One command, and the process is isolated from the internet.

If privacy, control, and simplicity matter to you, this tool is hard to beat.

What Is ProcNetBlocker?

ProcNetBlocker is a portable Windows CLI utility designed to block network access for specific processes using the built-in Windows Firewall.

Instead of manually creating inbound and outbound firewall rules, ProcNetBlocker automates the entire process. You tell it what to block, and it handles the rest in seconds.

This makes it especially useful for:

• Blocking telemetry-heavy applications
• Forcing software into offline mode
• Stopping suspicious background network activity
• Quickly reacting to a misbehaving process

Two Powerful Ways to Block Network Access

ProcNetBlocker offers two distinct methods, depending on how permanent you want the block to be.

1. Block a Running Process by PID (Instant Action)

If an application is already running and you want to cut its network access immediately, blocking by Process ID (PID) is the fastest option.

You can find the PID using Task Manager or the tasklist command, then run:

procnetblocker.exe --block 1234

This is ideal for:

• Emergency situations
• Temporarily isolating a process
• Debugging or testing offline behavior

2. Permanently Block an Executable by Path

For long-term control, you can block an application by specifying the path to its executable. This creates a persistent firewall rule that applies every time the app is launched.

procnetblocker.exe --block "C:\Path\To\App.exe" --exe

This approach is perfect for:

• Telemetry-heavy software
• Apps that don’t need internet access at all
• Enforcing strict privacy rules

Once blocked, the application stays offline unless you explicitly remove the rule.

Check If an App Is Blocked

Want to confirm whether an executable is currently restricted?

procnetblocker.exe --status "C:\Path\To\App.exe" --exe

This is useful when managing multiple rules or auditing your system’s network restrictions.

Restore Network Access

Need to undo a block? ProcNetBlocker makes that just as easy:

procnetblocker.exe --unblock 1234

No leftover rules, no manual cleanup required.

System Requirements and Compatibility

• Windows versions: Windows 7, 8, 10, 11 (64-bit)
• Windows Server: Supported (64-bit editions)
• Admin rights: Required (firewall access)
• Windows Firewall service: Must be running
• Package size: ~7.5 MB (portable ZIP)

No installation needed—just extract and run.

Why ProcNetBlocker Is Worth Using

ProcNetBlocker fits perfectly into a privacy-focused Windows setup. If you already use security tools like CrowdSec on servers or advanced endpoint protection, this utility makes an excellent companion for desktop systems.

It’s fast, transparent, and does exactly one thing—giving you full control over which processes are allowed to talk to the internet.

No bloat. No telemetry. No nonsense.

Conclusion

Windows gives you powerful firewall capabilities, but accessing them shouldn’t feel like solving a puzzle. ProcNetBlocker strips away the complexity and puts control back in your hands with a few simple commands.

If you care about privacy, want to reduce unnecessary network chatter, or just like keeping tight control over your system, ProcNetBlocker is a must-have tool in your Windows toolbox.

Sometimes, the best security tools are the simplest ones.