Little Snitch

Little Snitch 2

Little Snitch 2.5.4 - August 27, 2012

  • Fixes an issue causing the software update alert appear too often.
  • Minor bugfixes

Little Snitch 2.5.3 - June 28, 2012

  • Improved stability
  • Minor bugfixes

Little Snitch 2.5.2 - May 3, 2012

  • Fixes a crashing bug in Network Monitor.
  • Fixes an issue related to Fast User Switching causing increased CPU load.

Little Snitch 2.5.1 - April 5, 2012

  • Adds a preference option allowing to specify whether destinations of other user’s connections shall be shown in Network Monitor.
  • Fixes an issue causing the automatic software update preference settings not to persist.

Little Snitch 2.5 - March 21, 2012

  • Automatic software update.
  • Improved screen sharing support.
  • Improved privacy: Network Monitor no longer shows the destination of other user’s connections.
  • Fixes a rare kernel panic.
  • Fixes a bug in combination with sockets of protocol divert.

Little Snitch 2.4.4 - October 10, 2011

  • iCloud ready.
  • Adds new factory rules for smooth iCloud operation. You can review these rules by searching for the term "iCloud" in the Little Snitch Configuration application.
  • Removed a log message.

Little Snitch 2.4.3 - October 3, 2011

  • iCloud ready.

Little Snitch 2.4.2 - August 8, 2011

  • Improves OS X Lion compatibility.
  • Fixes a kernel panic.

Little Snitch 2.4.1 - July 29, 2011

  • Improves OS X Lion compatibility.
  • Fixes an incompatibility with Mac App Store and Software Update.
  • Fixes an incompatibility with Parallels Desktop.
  • Fixes an issue causing the lock button not to be shown in the preferences window.
  • Audio alerts now only occur if the connection attempt is related to the current front process.

Little Snitch 2.4 - July 13, 2011

  • Compatibility with Mac OS X 10.7 Lion.
  • New toolbar icons designed by Dietmar Kerschner.

Little Snitch 2.3.6 - April 27, 2011

  • Fixes an issue that could cause a kernel panic in conjunction with Dropbox.
  • Fixes an incompatibility with PowerPC machines running Mac OS X 10.4 Tiger.

Little Snitch 2.3.5 - April 20, 2011

  • Fixes an issue during restart or shut down that caused a “Little Snitch UIAgent canceled shut down” message to appear.
  • Addresses an issue that could cause Network Monitor to crash under rare circumstances.
  • Optimizes handling of UDP connections.

Little Snitch 2.3.4 - February 28, 2011

  • New preference option to enable reverse DNS lookups in Network Monitor.
  • Improved performance.
  • Improved Installer application (more robust in non-standard environments).
  • Improved compatibility with older PowerPC machines running Mac OS X 10.4.11.
  • Fixes an issue with the “Confirm with Return and Escape” preference option.
  • Fixes an issue that could cause a kernel panic on machines with 64-bit kernel.

Little Snitch 2.3.3 - November 24, 2010

  • Several improvements related to domain rules.
  • Host and IP rules have priority over domain rules.
  • Improved handling of multi level cname redirection.
  • Improved Installer application to better deal with modified system installations.

Little Snitch 2.3.2 - October 28, 2010

Little Snitch Configuration

  • The “Globally for all users” option in the rule editor sheet is now also accessible for temporary “Until Quit” rules, provided that the “Until Quit” option has been turned off. This allows to convert temporary rules into global rules in one go.
  • In addition to the ⌥⌘F menu shortcut the “Search Rules” command can now also be invoked with ⌘F.
  • Addresses an issue when creating a selection of multiple rules with the keyboard via Shift-Up/Down.
  • Addresses an issue causing the checkbox column of the rules window to be shown at startup, even if “Show Disabled Rules” is turned off.


  • Addresses an occasional incompatibility with MobileMe that could cause a hang at login.

Little Snitch 2.3.1 - October 21, 2010

  • Addresses an issue that could cause a hang.
  • Addresses an issue that sometimes caused network connections to hang or be delayed.
  • Fixes an issue that could cause a kernel panic under rare circumstances.

Little Snitch 2.3 - October 19, 2010

  • New Domain rules matching an entire domain instead of just a particular hostname.
  • Redesigned connection alert window.
  • Text in connection alert window can now be selected and copied with ⌘C.
  • Addresses an issue with Google Software Update related connection alerts.
  • Addresses an issue causing increased CPU load under rare circumstances.
  • Improved behaviour when scrolling the rules list with the arrow keys.
  • Improved Installer application to better handle existing but corrupted installations.
  • Fixed: The preferences lock no longer shows up opened within the first few minutes after log in to an admin user account.
  • Fixed: Incorrect display of Finder icon in Little Snitch Configuration.
  • Fixed: Incorrect rollover hint text in rules list.

Little Snitch 2.2.4 - July 12, 2010

  • Improved support of restoring from a backup system like Time Machine.
  • Improved automatic IP address update of hostname based rules.
  • The Connection Alert panel adjusts its size to fit long application names.

Little Snitch 2.2.3 - May 12, 2010

  • Fixed an issue when creating rules by dragging an application into the Little Snitch rules window.
  • Fixed a localization issue in the preferences window.
  • Fixed: Some applications were not shown with their correct app icon.
  • Improved detection of invalid rules.
  • Some minor UI improvements.

Little Snitch 2.2.2 - March 9, 2010

  • Improved IPv6 support.
  • Improved German localization.
  • Improved display of inactive rules in rules window.
  • Fixed: Unnecessary connection alerts with “Deny any connection” rules and IPv6 addresses.

Little Snitch 2.2.1 - January 25, 2010

  • New rules can now be created by dragging an application icon into the rules window.
  • Added a new “Turn into Global Rule” command to contextual menu.
  • Improved alert message when attempting to delete a protected rule.
  • Improved detection of invalid process paths.
  • Added “via” info to summary of “Don’t show in Network Monitor” rules.
  • The “Buy” button is now removed after successful registration.
  • Fixed: Clicking in the application column didn’t select all rules of this process.
  • Fixed: Changing a rule’s “approved” status didn’t immediately update the status icon.
  • Fixed: Long hangs after accepting / editing rules.

Little Snitch 2.2 - September 28, 2009

  • This version is compatible with Mac OS X 10.6 Snow Leopard.
  • Support for 64-bit kernels has been added.
  • Little Snitch’s Connection Alert displays more process attributes in detail view.
  • Global rules (if enabled) can now be created directly from the Connection Alert.
  • A factory rule for MobileMe has been added.
  • Better support for Unix root user logging in at the Mac OS X login window.
  • Network Monitor labels applications owned by other users with that user’s name.
  • Network Monitor memory consumption has been reduced.
  • Little Snitch Installer has been improved to cope with partially broken or modified Mac OS X installations.

Little Snitch 2.1.4 - June 4, 2009

  • Fixed an issue causing system freezes at login on Mac OS X 10.4 Tiger.
  • Fixed a bug causing repeated connection alerts.
  • Fixed a bug related to rule matching precedence.
  • Minor usability improvements in Little Snitch Configuration.
  • Fixed an issue causing rules with relative process path to show up as “invalid”.

Little Snitch 2.1.3 - May 19, 2009

  • Improved support for network user accounts.
  • Improved “Back up Rules” functionality.
  • Fixed an issue causing system freezes at login to network user accounts.
  • Fixed a bug causing lots of mDNSResponder connection alerts.
  • Fixed a rare crashing issue with the Little Snitch Installer.

Little Snitch 2.1.1 - May 11, 2009

  • Fixed a bug in “Restore Factory Rules” which led to an empty ruleset.

Little Snitch 2.1 - May 11, 2009

  • Added support for guest accounts.
  • Improved Fast User Switching support.
  • Global rules (computer wide rules valid for all users).
  • Improved support for network user accounts.
  • Improved support for virtual network interfaces.
  • Fixed a bug when identifying JavaApplicationStub with 64-bit version of Java.
  • Fixed a bug causing ntpd to show up as “sh” in Network Monitor.
  • Fixed a bug causing a rule with unresolvable DNS name to block any connection.
  • Improved uninstall procedure within Little Snitch Installer.

Little Snitch 2.0.5 - January 26, 2009


  • Improved compatibility with various screen savers.
  • Improved Little Snitch Installer.

Network Monitor

  • Fixed context menu entry “copy IP address”.
  • Fixed memory consumption problem.

Little Snitch 2.0.4 - August 13, 2008


  • Improved compatibility with 64-bit PPC machines.
  • Fixed a kernel panic triggered by various Java development suites.
  • Improved Little Snitch Installer.

Network Monitor

  • Support for multiple screens has been improved. The window position and the maximum number of displayed processes is now stored per screen configuration.

Little Snitch 2.0.3 - April 4, 2008


  • Several improvements of the Little Snitch Installer. The installer now properly upgrades from versions prior to 2.0.2.
  • Improved support for Mac OS X 10.5 Leopard FileVault accounts.
  • Improved support for Mac OS X 10.5 Leopard screen savers.
  • Fixed a bug with VoiceOver on Mac OS X 10.5 Leopard.
  • Fixed a bug which could cause a kernel panic.
  • Fixed a bug which could lead to a very large log file.

Network Monitor

  • Fixed occasionally crash when using BitTorrent clients and alike.
  • Fixed “freeze” problem after running Windows via Boot Camp.
  • Changed the text color of the selected process for better readability.

Little Snitch 2.0.2 - January 30, 2008

Configuration Application

  • A new toolbar icon allows to quickly lock and unlock the ruleset to prevent rules from being changed by unauthorized users.
  • The configuration program now quits automatically when the last window has been closed. Note that the Network Filter still operates in background, so it’s not necessary to keep the configuration application running. You can restart the configuration application at any time from your Applications folder.
  • Improved scrolling performance in the rules list.

Network Monitor

  • Terminated processes are now marked grey (instead of red) and with a “terminated” keyword.
  • Fixed a problem under Leopard regarding the status icon (show window when hovering over icon).
  • Improved performance (fixed CPU usage problem when using BitTorrent clients and alike).


  • Fixed a bug which could cause threads in multi threaded applications to hang.
  • Several minor bug fixes and security enhancements.

Little Snitch 2.0.1 - December 5, 2007

  • Fixed a bug which could cause a kernel panic.
  • Fixed a bug where a newly created temporary rule enables a disabled permanent rule.
  • Fixed a bug where a rule with unknown / unresolvable DNS name was erroneously added as an Any Connection rule.
  • After a power failure or hard reset, recent changes to the rule set should now be preserved.
  • Fixed a bug where a “Little Snitch configuration has been modified” warning appeared after every restart.
  • Uninstall works more thoroughly now: also removes log files and registration info.
  • Incoming connections are now reliably attributed to applications on Mac OS X 10.5 Leopard (this is only relevant for Network Monitor).
  • Improved Network Monitor performance concerning BitTorrent and Skype clients.
  • Fix a bug in Network Monitor regarding the activation by hovering over the menu icon.
  • Several minor bug fixes.

Little Snitch 2.0 - November 8, 2007

  • Brand new configuration interface with full undo support, backup and restore functionality, powerful editing, searching and filtering capabilities, disabling of rules, text notes, and more.
  • New redesigned connection alert with simplified keyboard control.
  • Network Monitor for visualizing network activity in real-time
  • Much improved traffic filtering
  • “via” rules for applications communicating via Unix tools
  • DNS based rules
  • IPv6 support
  • Improved support for full screen applications
  • German Localization