How do I restrict access to a program in Windows 11?

How do I block an app from accessing the internet?

I think you'll have to set up an iptables rule on the machine that's running OpenVPN.

Here's an example from a CentOS install of OpenVPN: #iptables -A OUTPUT -p udp --dport 1194 -m state --state NEW -j ACCEPT. #iptables -A OUTPUT -p udp --dport 4500 -m state --state NEW -j ACCEPT. #iptables -A INPUT -p udp --dport 1194 -m state --state NEW -j ACCEPT. #iptables -A INPUT -p udp --dport 4500 -m state --state NEW -j ACCEPT. That would allow incoming connections on those ports but block them from outgoing connections.

How do I disable internet access for certain applications in Windows 11?

I've got a PC running Windows 11.

0.1511. It has 2 USB connected devices, and I don't want those devices to have internet access (incl. Accessing the web). How do I block that?

First of all, you should know that this is going to be a tricky question to answer. There are many ways to configure this, but they all start from this same basic principle: There is an app out there which is designed to do exactly this, and that app is called Network & Sharing Center.

The Network & Sharing Center is installed in Start You can also run it from the Run dialog box. (In Windows 8, you used to have to dig around for it in Programs This seems to have been lost in Windows 10 as of writing.) So, what's the first step when you want to disable internet access for an app? Right-click it in the Start menu. It will bring up the context menu. Click Properties. Click the Security tab. On the left, click Allow executing file as program. Click Ok.

Now you should be able to run the app just fine, as long as you haven't actually given it any access to anything on the internet. This was a step in that direction. But what about if you already did give that app internet access, or want to prevent it from using the internet? That's more complicated.

If you do give the app internet access, but you still want to block it, that's possible. Click the Network & Sharing Center icon, and then on the left, click Change adapter settings. Now, under Network adapters, click the one with the problem. (It's usually labeled "Windows network connection #2".) It should give you a list of connected devices. Click your problematic device to highlight it. Click Change.

On the right, look for Internet Protocol (TCP/IP) and click Properties. You may have to scroll down a bit. The important part is in the bottom half of the dialog box. Under Internet Protocol (TCP/IP) Settings, click "Internet Protocol (TCP/IP) properties".

You should see something like this.