Enable stealth mode on Mac and Windows firewall now to protect against spammers!

Go stealth mode!

You can opt to make your computer invisible to pings from the Internet, a common tactic of spammers who are looking for available machines to turn into spam relay stations.

Unless you have this feature enabled in your firewall, your computer can be used to send spam and your IP address (every computer on the internet carries this unique identifier) will be blamed for it!

Hide your PC or Mac from this parasitic spamming strategy and switch to Ninja mode now!

On both Macs and PCs it is disabled by default. Here’s how you can turn this protection mechanism on:

Apple Mac OS X

On Mac OS X 10.4 Tiger

  1. Go to System Preferences > Sharing
  2. Click the Firewall button
  3. Click Advanced
  4. Check Enable Stealth Mode

On Mac OS X 10.5 Leopard

  1. Go to System Preferences > Security
  2. Click the Firewall button
  3. Click Advanced
  4. Check Enable Stealth Mode
  5. For additional protection you can also turn on the firewall (I recommend the: Set access for specific services and applications option.)

On Mac OS X 10.8 Mountain Lion

  1. Choose Apple menu > System Preferences, then click Security & Privacy, and then select Firewall.
  2. Unlock the settings by typing an administrator name and password.
  3. Click Firewall Options.
  4. Select the Enable Stealth Mode checkbox.
Stealth Mode ON!

Windows PCs

On Windows XP

  1. Go to Control Panel > Windows Firewall
  2. Click the Advanced tab
  3. Next to ICMP click Settings
  4. Uncheck the first option “Allow incoming echo request”

On Windows Vista

You must be logged on as an administrator to perform these steps.

To find ICMP and logging settings, open Windows Firewall with Advanced Security.

  1. Click to open Administrative Tools.* If you are prompted for an
    administrator password or confirmation, type the password or provide
  2. Double-click Windows Firewall with Advanced Security.

To change logging settings:

  1. Under Public Profile, click Windows Firewall Properties.
  2. Click the tab for the profile that you want to change.
  3. Under Logging, click Customize.
  4. In the dialog box that appears, change the settings you want to
    change, and then click OK.

You can specify ICMP settings by creating inbound or outbound rules using
the ICMPv4 or ICMPv6 protocol.

On Windows 7

As far as we can tell stealth mode is turned on by default in Windows 7. It seems turning it off is more of a struggle but perhaps a more experienced Windows user can educate us and we will edit this article.

UPDATE: The Windows 7 firewall appears to be a little more complicated. For beginners you would do well to look at this free firewall software made by a very reputable company, Comodo. The free software can be found here: Comodo Firewall.


This will set both systems to drop any incoming ping request and effectively hide your computer from this type of spamming strategy.

Of course this isn’t the only thing you can do to avoid spam but at least now they can’t share their filth using your PC!!

Ninja Lego Boys
We’re coming for you spambots!
photo credit: nyargle via photo pin cc

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