Block a specific program from accessing the Internet #

Open Windows Firewall with Advanced Security (wf.msc)
Click "Outbound Rules"
Click "New Rule…"
Click "Program" > "Next"
Click "This program path" > "Browse" > select program to block > "Next"
Click "Block the connection" > "Next"
Leave Domain, Private, and Public checked > "Next"
Type desired name for rule and click "Finish"

If that seems too tedious, check out OneClickFirewall. It adds a context menu item to "Block Internet Access" and another to "Restore Internet Access", leveraging outbound rules in Windows Firewall with Advanced Security.

UPDATE:

macOS: Radio Silence "lets you keep a list of apps that aren't allowed to make network connections."
Linux: unshare -Un program (among other methods; had to enable unprivileged user namespaces in Debian 10.10 via /usr/sbin/sysctl kernel.unprivileged_userns_clone=1)
Previously: Block apps from making network connections

/windows | Jun 04, 2016

Subscribe or visit the archives.