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Frequently Asked Questions

  • License & Registration

    • I have lost my license key!

      Please visit the Little Snitch Support pages and enter your email address to retrieve your lost license key. Little Snitch Support > Lost License
    • For which version of Little Snitch is this license key?

      Little Snitch license keys can be distinguished by their first two characters:

      • Little Snitch 4 license keys begin with “34…”
      • Little Snitch 3 license keys begin with “33…”
      • Little Snitch 2 license keys begin with “32…”
    • I have a problem with my order!

      If you have a question or a problem related to your order, please contact our sales support team.
    • I didn’t receive my license key!

      Delivering of the license key may take up to 15 minutes. Please also make sure the email is not in your spam folder. If you still did not receive the license key please contact our sales support team.
    • How can I upgrade my Little Snitch license to version 4?

      You can upgrade your existing Little Snitch license (version 2 or 3) to the latest version 4 at a reduced upgrade price.

      If your license key begins with “34…”, your license is already valid for version 4 and no upgrade is required. If you don’t have your license key at hand, you can find it in Little Snitch Configuration > Preferences > Registration > Serial Number.

    • Can I use my single license on a second computer?

      A single license is valid for all your machines as long as you are the only user.
    • Can I use the family license on a laptop even if I am not at home?

      Of course! A family license is valid for up to five computers, used by people living in the same household.
    • How can I determine the number of seats necessary for a multi license?

      The number of required seats is either the number of computers or the number of persons using these computers — whichever number is lower. For example, an office with five employees and eight computers would need a 5-seat license to use Little Snitch on all computers.
    • Do you offer student discounts?

      Yes, student discounts for Little Snitch are available at the Student App Centre website.
  • Installation

    • How can I verify the integrity of the Little Snitch download?

      Assuming you’ve downloaded the Little Snitch Disk Image (.dmg file) to your Downloads folder, open a new Terminal window and type the following command:

      codesign --verify -R="anchor apple generic and certificate leaf[subject.OU] = MLZF7K7B5R" ~/Downloads/LittleSnitch*.dmg

      If the result of this command is empty (no error message), the file is intact and properly signed.

      However, if an error message is shown (like “not signed at all” or “failed to satisfy specified code requirement(s)”), this indicates that the file was maliciously modified and is no longer signed by Objective Development. In that case you should NOT open the disk image file.

    • Are my rules preserved when upgrading to Little Snitch 4?

      Yes, your existing rules from Little Snitch 3 will be preserved.
    • I have installed the Little Snitch 4 Trial. Can I downgrade to version 3?

      Yes. Simply download and install Little Snitch 3 from our download page. Your rules and settings will be preserved.
    • After installing on macOS High Sierra I get the message: “System Extension Blocked”

      Please visit our High Sierra Compatibility page for information about installing and running Little Snitch 4 on macOS High Sierra.
    • How can I uninstall Little Snitch?

      As Little Snitch consists of multiple parts it is essential to run the Little Snitch Uninstaller to make sure all components are removed from your system. Little Snitch 3.4 or newer automatically starts the uninstaller as soon as you move the Little Snitch Configuration into your trash. For earlier versions please locate the installer in the following path /Library/Little Snitch/Little Snitch Uninstaller.app and start it manually.

      The uninstaller lets you choose whether to remove or preserve user specific data (like rules and settings). If you want to remove those items manually, delete the following files and folders (the “~” tilde sign refers to your home folder):

      • /Library/Application Support/Objective Development/Little Snitch/
      • ~/Library/Application Support/Little Snitch/
      • ~/Library/Preferences/at.obdev.LittleSnitchConfiguration.plist
      • ~/Library/Preferences/at.obdev.LittleSnitchNetworkMonitor.plist
      • ~/Library/Preferences/at.obdev.LittleSnitchInstaller.plist

  • Technical Questions

    • Can I restore my rules from a Time Machine backup or any other backup?

      Yes. Please retrieve one of the following files from your backup:

      • Complete Ruleset: /Library/Application Support/Objective Development/Little Snitch/configuration.xpl
      • User Specific Ruleset: ~/Library/Application Support/Little Snitch/configuration.user.xpl

      You can then import the file via Little Snitch Configuration > Rules > Import from Backup.

    • Can I move the Little Snitch menu bar icon?

      Starting with macOS 10.12 Sierra it’s possible to arrange third-party menu bar icons via Command-drag (hold down the Command key and drag the item to the desired position).

      In previous OS versions, third-party menu bar icons are at fixed positions and can’t be moved. Third-party tools like Bartender make it possible to arrange the items also in OS versions before 10.12 but for security reasons Little Snitch can not be used with such tools.

      If you just want to save space in your menu bar you can simply turn off Little Snitch’s menu bar icon. The functions in it can also be accessed in the Little Snitch Configuration application’s preferences and you can open the Network Monitor window also via a configurable keyboard shortcut.

    • How can I backup my Little Snitch rules?

      Open the Little Snitch Configuration from the menu choose Rule > Backup. This will create a backup file at the location of your choice. You can restore your rules using that file later via Rule > Import from Backup.
    • Why isn’t the Network Monitor showing my local network traffic?

      By default, local network traffic is hidden in Little Snitch Network Monitor. If you want to see this traffic as well, you just have to enable “Show Local Network” in the Little Snitch Network Monitor menu.
    • Why can’t I zoom out to see the whole world in the map?

      This is a technical limitation of Apple Maps, the service that we are using for showing the map in Network Monitor. Apple’s Maps.app has the same limitation and doesn’t let you zoom out far enough to see a map of the whole world at once.
    • How can I turn off Little Snitch temporarily?

      Open the Little Snitch Configuration application from your Applications folder, open Preferences > General and click the Stop button to turn off the Network Filter. Any network traffic will then be allowed, such as if Little Snitch wasn’t installed at all. If you are using the Little Snitch menu bar icon, you can also stop the filter by choosing “Stop Network Filter” from the menu.
    • Does Little Snitch handle incoming network connections?

      Since version 3 Little Snitch also can handles and filter incoming connections. They are labeled with this icon: Incoming Connection Icon

    • Is it possible to sync rules and profiles between different computers?

      No, sorry, this is currently not possible.
  • Troubleshooting

    • Why do I get the Connection Alert again even though I have already created a rule?

      There are several possible causes for such behavior of Little Snitch.

      First of all you really need to make sure that you have set the lifetime for the rule to “Forever“ when creating it (as opposed to “Once“, or “Until Quit“ etc.)

      Then it’s also necessary that the path of the application (where it resides on your disk) remains unchanged. If you move an app to a different folder, the rules you created earlier for this app will cease to match.

      Unfortunately the path of an application can also change without your explicit doing. If the path displayed in Little Snitch’s Network Alert contains parts like /private/var, it’s likely that the issue is related to the “Gatekeeper” functionality of macOS. See this blog post for further details.

    • I cannot enter any characters into the license code field!

      Make sure that you are accessing the computer via a keyboard directly connected to it. Changing the settings or entering the license code via any kind of remote access (e.g. Screen Sharing) will not work with the default security settings of Little Snitch.
    • The language of Little Snitch changed from English to German!

      You would need to change the order of your preferred languages in your macOS System Preferences > Language & Region settings and make sure that English is further up in the list than German. After a restart Little Snitch should then be localized in English.
    • Little Snitch does not accept my license key!

      Valid license keys for Little Snitch 4 start with “34…”, keys for version 3 start with “33…”. They are about 25 characters long.

      When entering the license key, please copy and paste the key to avoid typos. If it still does not work, please contact our sales support team.

    • My computer doesn’t start after installing Little Snitch!

      Little Snitch consists of multiple parts, some of them operating at a low level of the operating system, called the kernel. Little Snitch needs to trigger an update of kernel caches and requires a reboot during installation. Under rare circumstance this kernel cache update might fail, which may prevent your computer from starting.

      If this happens during the installation of Little Snitch on your computer, please start it in safe mode by holding the Shift key (⇧) (you can find more information about safe mode here). If you are using OS X Yosemite or earlier, please repair your disk permissions using Disk Utilities.app (for detailed instructions see How & Why to repair disk permissions in OS X). As second step, start the Little Snitch Installer once again and perform a restart as instructed.

      Usually this solves the issue. If you are still unable to start your computer, please get in touch with our tech support team.

    • How can I determine which rule is blocking a connection?

      In case Little Snitch blocks any process, this is indicated in realtime at the Little Snitch Network Monitor with the connection request blinking in red color. The hostname or IP address of the blocked connection will remain highlighted in red afterwards and you can right-click on it and choose “Show Corresponding Rule” to open up the Little Snitch Configuration and manage the rule.
    • I updated Little Snitch and now got a “Little Snitch Version Mismatch Detected” message. What does that mean?

      At least one component of Little Snitch has not been updated correctly and most likely this is related to an issue with the kernel cache. As Little Snitch consists of multiple parts (including a kernel extension) it is necessary to update the kernel cache after the installation. Updating the kernel cache might reveal issues with third-party extensions. Please try to restart the system, run the Little Snitch Installer again. If the issue persists please generate a diagnostics report and contact our tech support team.
    • Remote Access via TeamViewer or RealVNC doesn’t work!

      In Little Snitch 3.7.2 we have improved protection against simulated keystrokes and mouse clicks to make sure that malicious software cannot change your firewall settings by simulating user interaction.

      Unfortunately this also affects software that allows you to access your Mac remotely (like TeamViewer, RealVNC, etc).

      If you do need remote access Little Snitch, you have to enable the “Allow GUI Scripting access to Little Snitch” option in Little Snitch Configuration > Preferences > Security.

    • Little Snitch blocks connections for Prey (preyproject.com) and I can not create or see the corresponding rules!

      Prey is installed under a separate user account (user: ‘prey’) on the system. In order to access its Little Snitch rules you have to open the Little Snitch Configuration as the user ‘prey’ by entering the following Terminal command (/Applications/Utilities/Terminal.app) and pressing Return:

      sudo -u prey /Applications/Little\ Snitch\ Configuration.app/Contents/MacOS/Little\ Snitch\ Configuration

      After entering your admin password when prompted, you should be able to see the Little Snitch Configuration window with one or more rule suggestion(s) for the Prey process named “node“ in the Suggestions > “Login Connections“ category. Select one of the rules and click on the “More“ button at the top right of the suggestions list. In the appearing popup menu choose “Allow any connection“. After closing the Little Snitch Configuration and restarting your system, all connections for Prey will be allowed.

    • Notifications about “Incoming Connection Denied” won’t stop appearing!

      Little Snitch cannot stall certain kinds of incoming connections or data. Please see Little Snitch help, chapter “Incoming connections” for more information.

  • Compatibility

    • Is Little Snitch compatible with macOS 10.13 High Sierra?

      Yes, Little Snitch 4 and Little Snitch 3.8 are compatible with macOS 10.13 High Sierra.

      • Download Little Snitch 4
      • Download Little Snitch 3.8

      Please also visit our High Sierra Compatibility page for information about installing and running Little Snitch on macOS High Sierra.

    • Is Little Snitch compatible with macOS 10.12 Sierra?

      Yes, Little Snitch 3.7 or newer is compatible with macOS 10.12 Sierra.

      Download Little Snitch

    • Is Little Snitch compatible with OS X 10.11 El Capitan?

      Yes, Little Snitch 3.6 or newer is compatible with OS X 10.11.

      Download Little Snitch

    • Is Little Snitch compatible with OS X 10.10 Yosemite?

      Yes, Little Snitch 3.6 or newer is compatible with OS X 10.10.

      Download Little Snitch

    • Is Little Snitch compatible with OS X 10.9 Mavericks?

      Little Snitch 3.6.4 is the latest version compatible with OS X 10.9.
      The download is available on this page.
    • Is Little Snitch compatible with OS X 10.8 Mountain Lion?

      Little Snitch 3.3.4 is the latest version compatible with OS X 10.8.
      The download is available on this page.
    • Is Little Snitch compatible with OS X 10.7 Lion?

      Little Snitch 3.3.4 is the latest version compatible with OS X 10.7.
      The download is available on this page.
    • Is Little Snitch compatible with OS X 10.6 Snow Leopard?

      Little Snitch 3.3.4 is the latest version compatible with OS X 10.6.
      The download is available on this page.
    • Is Little Snitch compatible with OS X versions prior to 10.6?

      Legacy versions of Little Snitch provide support back to OS X 10.2 Jaguar.
      Downloads are available on this page.
    • Where can I find older versions of Little Snitch that support older versions of OS X?

      Older versions of Little Snitch can be found on this page. Please try to use the most recent version of Little Snitch that supports your operating system.
    • Will Little Snitch be available for iOS, tvOS and watchOS?

      Unfortunately Apple’s regulations and submission guidelines do not allow applications like Little Snitch that operate on the system level on the iOS (iPhone, iPad, iPod touch), tvOS (Apple TV), or watchOS (Apple Watch) platforms.
    • Will Little Snitch be available for other operating systems like Linux or Windows?

      Our entire team consists of longtime macOS developers and we love the Mac platform. It is therefore very unlikely that a version for a different platform will be available in the near future.
    • Does Little Snitch work on machines running NVDIA Web Drivers?

      Only partially. The NVIDIA Web Drivers (as opposed to the original drivers provided by Apple) need to inject program code into running apps and Little Snitch (as some other apps like iBooks) do not allow that for security reasons. Therefore the Little Snitch Network Monitor can not show its inspector and map view.
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© 2018 Objective Development Software GmbH | About Us | Press

© 2018 Objective Development Software GmbH

About Us | Press