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7. Security Checklist > 7.2. Scan Your System for Open Ports

Scan Your System for Open Ports

Each open network port on your computer is a potential security vulnerability. Fortunately, there's a way to scan your computer for open ports so you know which holes to patch. Start by opening a command prompt window (cmd.exe) and running utility by typing netstat /a /o. The Active Connections utility displays its information in these five columns:

Column

Description

Proto

This will be either TCP or UDP, representing the protocol being used.

Local Address


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