Carnegie Mellon University

Secure Your macOS Computer

  1. Click Apple menu > System Preferences > Software Update.
  2. Click Automatically keep my Mac up to date to enable it.
  3. When prompted, enter the Administrator userID and password for your computer.
  4. If any software updates are available for installation, click Update Now. Follow the prompts to download and install the software.
  1. Update other software applications you may have. Most applications can be updated by selecting Check for Updates in one of the following menus: Application, Preferences or Help.
  2. Run QUALYS Browser Check regularly. This tool will walk you through updating any browser-related applications; and will help you protect your computer from those actively exploiting security flaws through the web.
  1. Remove all other antivirus software before installing.
  2. Install recommended antivirus software.

Password Protect Your Computer

  1. Select Apple menu > System Preferences > Users & Groups.
  2. Click the lock icon and enter an Administrator username and password when prompted.
  3. Select the account you are using and click Change Password. If others use this computer, create a separate account and password for each person.
  4. Follow the on-screen steps.

Turn on the Firewall

  1. Select Apple menu > System Preferences > Security & Privacy.
  2. Click the lock icon and enter an Administrator username and password when prompted.
  3. Click Firewall. If the firewall is not on, click Start or Turn On Firewall.
  4. Click Firewall Options.
  5. Verify the following settings and click OK.
    • Uncheck - Block all incoming connections.
    • Check - Automatically allow built-in signed software to receive incoming connections.
    • Check - Automatically allow downloaded signed software to receive incoming connections.
    • Uncheck - Enable stealth mode.

Password Protect Your Screen Saver

  1. In Security and Privacy, select the General tab.
  2. Click the lock icon and log in when prompted.
  3. Check Require password and choose immediately from the drop-down menu.
    Note: This option ONLY applies to the current account.
  4. Verify that the following are selected (checked):
    • Disable Automatic login
    • Allow applications downloaded from: App Store and identified developers.
  5. Click the lock icon to prevent further changes and then click the back arrow.
  6. Select Desktop & Screen Saver, then the Screen Saver tab.
  7. Select 10 Minutes from the Start after drop-down menu.
  8. Close the window.