Configuring Windows firewall to block all outgoing connections

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Block All Outbound Traffic

Block All Outbound Traffic is a firewall rule in Windows that prevents all outbound network traffic unless a specific rule allows it. This is typically used in highly secure environments where strict control over data leaving the system is required. Creating this rule ensures no applications can access the internet or local network unless explicitly permitted through a separate firewall rule.

Steps to Create the Rule

1. Open Windows Defender Firewall with Advanced Security.
2. In the left pane, click on Outbound Rules.
3. On the right pane, click on New Rule.
4. Select Custom, then click Next.
5. Choose All Programs, then click Next.
6. Leave the default settings under Protocol and Ports, click Next.
7. Leave the default settings under Scope, click Next.
8. Under Action, select Block the connection, then click Next.
9. Under Profile, check Domain and Private. (Uncheck Public if required.) Click Next.
10. Name the rule: Block All Outbound Traffic, then click Finish.

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