Configuring Firewall Rules for In-Browser Kali and Windows – OffSec Support Portal

If you are trying to use In-Browser Kali and Windows in an environment with strict firewall rules—such as an office network or other restricted environments—you may need to adjust your network settings to ensure proper access.

Who Needs This Configuration?

This guidance is only necessary for users working in environments with enforced strict firewall policies. For instance:

Office buildings
Corporate networks
Restricted institutional networks

If you are using a personal network or one without strict restrictions, this configuration is typically not required.

Required Firewall Configuration

FQDNs to Allow:

Outbound Port to Allow:
- Port: 443
- Protocol: TCP - specifically for encrypted websocket connections (wss://).

If you’re on an office network, share this article with your IT team to make the necessary changes.

For more information about In-Browser Kali and Windows, and the courses in which they are used, please refer to the Connectivity Guide.

Need Further Help?

If you are still experiencing issues, please contact us at help@offsec.com for assistance.

Who Needs This Configuration?

Required Firewall Configuration

Need Further Help?

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