By default, Personal Firewall security type is set to Smart Access, which allows programs only to send information.
Generally, when you select a restrictive security type like Stealth or Monitored Access, you need to handle more options and alerts than you would with a permissive security type like Smart Access.
The following table describes the security types, starting with the least restrictive.
| Security type | Description |
|---|---|
| Smart Access | Automatically allow known programs on your PC to send and receive information over the Internet. |
| Monitored Access | Monitor information that is sent to and from programs on your PC. Personal Firewall prompts you to allow or deny access when unrecognized programs attempt to send or receive information, providing more control and security. |
| Stealth | Block all incoming Internet connections—except for ports that are allowed in system service ports—to keep your PC from being detected on the Internet. Stealth reduces the risk that a hacker can compromise your security. Personal Firewall prompts you to allow or deny access when programs attempt to send or receive information. |
| Lockdown | Instantly block all incoming and outgoing traffic, effectively disconnecting your PC from the network and the Internet. You might want to do this when you suspect a security vulnerability or attack. |
 | When you define permissions for programs — by allowing or denying access to the Internet — those programs appear on the Internet Connections for Programs page. |