Where to find your firewall and what it's doing

Your firewall is a built-in security tool that sits between your computer and the internet, deciding which programs can send and receive data. You don't need to install it — Windows and Mac both come with one running automatically. To see what yours is doing right now, you open the security settings in your operating system and look at the firewall section. The steps differ between Windows and Mac, but the goal is the same: confirm the firewall is on and see which programs have permission to communicate.

Most people never need to change firewall settings. The default setup blocks dangerous incoming connections while letting your web browser, email, and other common programs work normally. But if a program suddenly stops connecting to the internet, or if you're troubleshooting a network problem, checking the firewall is one of the first places to look.

Key Takeaways

  • Windows Defender Firewall and macOS firewall are built in and on by default — you access them through Settings, not a separate program.
  • The firewall blocks incoming connections by default but lets your programs send data out, which is why most people don't notice it.
  • If a program can't connect to the internet, the firewall may have blocked it, and you can see which programs have permission in the firewall settings.
  • Turning the firewall off completely is not recommended — instead, add the specific program to the allowed list if it needs internet access.

Checking firewall settings on Windows 10 and 11

Open the Start menu and type "firewall" into the search box. Click Windows Defender Firewall when it appears. This opens a window showing whether your firewall is on or off. You should see a message saying "Windows Defender Firewall is on" with a green checkmark. If it says "off" with a red X, your firewall is disabled and you should turn it back on by clicking Turn Windows Defender Firewall on or off on the left side.

To see which programs the firewall allows through, click Allow an app through firewall on the left side. A new window opens showing two lists: one for private networks (your home or office) and one for public networks (coffee shops, airports). Programs listed here can send and receive data even though the firewall is on. If a program you use is missing from this list and can't connect to the internet, you can add it by clicking Allow another app and browsing to the program's file.

You can also reach the same settings through the main Settings app: go to Settings > Privacy & Security > Windows Security, then click Firewall & network protection. Both paths lead to the same place.

Checking firewall settings on Mac

Click the Apple menu in the top-left corner and select System Settings (or System Preferences on older macOS versions). Click General in the sidebar, then scroll down and click Security & Privacy. Click the lock icon in the bottom-left corner and enter your password to make changes. Now click the Firewall tab.

You should see a button that says either Turn On Firewall or Turn Off Firewall. If it says "Turn On", your firewall is currently off and you should click the button to turn it on. If it says "Turn Off", your firewall is already on, which is the normal state. Click Firewall Options to see more details about how it's configured.

In Firewall Options, you can see whether your Mac allows unsigned apps to receive incoming connections. The default setting blocks unsigned apps, which is find for most people. If a program you trust can't connect and you've confirmed it's not a network problem, you can add it to the allowed list here, though this is less common on Mac than on Windows.

Understanding what "firewall is on" actually means

When your firewall is on, it doesn't block all internet traffic — it blocks incoming connections that you didn't ask for. Your web browser can still reach websites, your email app can still check messages, and your video calls still work. The firewall only says no to strangers trying to connect to your computer from the internet.

This is why you can have the firewall on and still use the internet normally. The firewall is not a speed bump or a filter that slows things down. It's a gatekeeper that lets your programs reach out and talk to the internet, but doesn't let random internet traffic reach your computer unless a program you've allowed has asked for it.

What to do if a program can't connect to the internet

If you install a new program and it can't reach the internet, the firewall may have blocked it. First, check whether the program appears in your firewall's allowed list. On Windows, open Windows Defender Firewall and click Allow an app through firewall. Look for the program's name. If it's not there, click Allow another app, browse to the program's installation folder, and select its main executable file (usually the one with a .exe extension). On Mac, open Firewall Options and look for the program in the list of allowed apps.

If the program is already in the allowed list but still can't connect, the problem is probably not the firewall. Check whether your internet connection itself is working by opening a web browser. If the browser works but the program doesn't, the issue may be with the program's settings or your network configuration, not the firewall.

Do not turn off the firewall entirely to fix a connection problem. Instead, add only the specific program that needs access. Turning off the firewall leaves your computer vulnerable to attacks from the internet, and the problem will likely return when you turn it back on anyway.

When to ask for help with firewall settings

If you've checked the firewall and the program is in the allowed list but still can't connect, or if you're not sure whether a program should be allowed through, contact the program's support team. They can tell you whether the firewall is the issue and what settings the program needs. You can also contact your internet provider if you suspect a network problem rather than a firewall problem.

If you're setting up a new network or connecting to a corporate network, your IT department may have specific firewall rules you need to follow. Ask them before changing any settings, because corporate networks often have firewalls configured at the network level, not just on individual computers.

Frequently Asked Questions

Will turning off the firewall make my internet faster?

No. The firewall does not slow down your internet connection. It makes decisions about which data to allow, but it does not reduce your speed. If your internet feels slow, the problem is elsewhere — your internet plan, network congestion, or the website or service you're using.

Can I have more than one firewall on?

You can, but you don't need to. Windows Defender Firewall and third-party firewalls can conflict with each other. If you install security software with its own firewall, you can usually turn off Windows Defender Firewall to avoid the conflict. Check your security software's documentation for instructions.

What does "private network" vs "public network" mean in firewall settings?

Private networks are ones you trust, like your home Wi-Fi or office network. Public networks are ones you don't control, like coffee shop Wi-Fi. The firewall can have different rules for each. On a public network, you might block more programs to be safer. At home, you might allow more.

If my firewall is on, why did I get a virus?

The firewall blocks incoming attacks from the internet, but it doesn't protect you from viruses you read yourself or from phishing emails. A firewall is one layer of security, not complete protection. Keep your operating system and programs updated, use antivirus software, and be careful what you read and click on.

Do I need to restart my computer after changing firewall settings?

No. Changes to the firewall take effect when ready. If you add a program to the allowed list, it can usually connect right away without a restart. If it still can't connect after a few seconds, try restarting the program itself.