How to Block a Program with Windows Firewall

Keep programs out of your business and the internet with Windows Firewall

This How.com.vn teaches you how to prevent a program from accessing your Windows computer network by blocking it in Firewall. You must have administrator privileges to access Firewall and block programs in it. Keep in mind that blocking a program from using Firewall doesn't usually prevent the program from running on your computer.

Things You Should Know

Open Firewall. Click Advanced settings > Outbound Rules > New Rule… > Next. Check "Program" > Next.
Select a program and copy its path. Click Open and paste in the copied path. Click Next three times, enter a name for your rule, and hit Finish.
To temporarily disable a program, open Firewall and click Allow an app or feature through Windows Firewall > Change settings. Check the box next to the program you wish to block and save.

Method 1

Method 1 of 2:

Blocking a Program

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Click the Windows logo in the bottom-left corner of the screen.
Type in Windows Defender Firewall, then click Windows Defender Firewall at the top of the Start window.
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It's a link in the upper-left corner of the Windows Firewall window.
This tab is on the left side of the window.
It's in the upper-right corner of the window. Doing so opens a new window in which you'll create your Firewall rule.
You'll find this option at the top of the page.
It's at the bottom of the window.
8
Select a program. Before you can block a program, you'll need to select the program in order to find its path:
- Check the "This program path" box and click Browse....
- Click This PC on the left side of the window.
- Scroll down and double-click your hard drive's name (e.g., OS (C:)).
- Double-click the Program Files folder.
  - If the program you want to block is elsewhere, go to the program's folder instead.
- Find the folder for your program, then double-click the folder.
- Select the program file by clicking it once.
9
Copy the program's path. Click the address bar at the top of the window to select the path there, then press Ctrl+C to copy the path.
- This is necessary because Windows will restructure the path to the file once you open the file in Firewall, thus breaking your outbound rule. You can bypass this problem by manually pasting in the path to the file.
It's in the bottom-right corner of the window.
11
Replace the path before the app's name with your copied one. Highlight the path in the "This program path" text box all the way up to the last backslash before the app's name, then press Ctrl+V to paste in your copied path.
- For example, if you wanted to block Chrome in the path "C:\Program Files\Google\Application\chrome.exe", you would select all but the "\chrome.exe" section and replace it with your copied text.
- Leaving the app's name and extension at the end of the path is crucial, as failing to do so will leave you with a rule that doesn't block anything.
This button is in the lower-right side of the window on each page. Doing so takes you to the final page.
13
Enter a name for your rule. Type whatever you want to name your rule into the top text box on the page.
- For example, if you're blocking Google Chrome on your computer, you might name your rule "Chrome Block" here.
It's at the bottom of the window. Doing so saves and applies your rule; from now until you delete or disable the rule, your program will not be able to access the Internet.

Method 2

Method 2 of 2:

Temporarily Disabling a Program

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Click the Windows logo in the bottom-left corner of the screen or press the ⊞ Win key.
Type in Windows Defender Firewall, then click Windows Defender Firewall at the top of the Start window.
This link is at the top-left side of the Firewall window.
4
Click Change settings. It's at the upper-right side of the window, just above the list of programs on your computer.
- You may have to click Yes on a pop-up window after doing this before you can continue.
- If you don't have administrator privileges on your computer, you won't be able to do this.
The list of programs in the middle of the page displays all programs that Windows Firewall is either blocking or allowing; you can scroll down it to find your specific program.
6
Add a program to the list if necessary. If you can't find your program in the list, you can add it by doing the following:
- Click Allow another app... below the list.
- Click Browse....
- Go to the location of the app or program file (usually an EXE) that you want to block.
- Select the app or program file.
- Click Open, then select the program's name in the window and click Add if it doesn't automatically add.
7
Click the checkmark to the left of the program. Doing so should remove the checkmark, thereby blocking the program through Windows Firewall.
- If there is no checkmark to the left of the program, Windows Firewall is already blocking the program.
- Leave the two checkboxes to the right of the program ("Home/Work (Private)" and "Public") alone.
It's at the bottom of the window. This will both save your changes and prevent the program from connecting through the network (and/or from running properly on your computer).

Community Q&A

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Question
What do I do if the name of the program doesn't appear on the list?
Community Answer
Choose the option "Allow another app," and find your program on the computer.
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Question
I unchecked the program, but soon it is checked again. Why is that?
Community Answer
When the program is unchecked, it means it's only temporarily blocked. It will unblock after a certain period of time. If you wish to fully block it, remove it from the list.
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How do I block cookies?
Community Answer
Cookies can be blocked via your browser settings. Additionally you can deselect the option to store cookies on your computer, and clear existing ones by getting a legitimate anti-malware program.
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Tips

Blocking a program through the Firewall is a good way to prevent persistent malware or bloatware from slowing down your computer.
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If you don't know where the program you want to block is, you can find it by right-clicking the program's shortcut, clicking Open file location, and repeating until you get to the program's folder.
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