About the Mac OS X Server v10.6.8 Update

This software updates Mac OS X Server v10.6, v10.6.1, v10.6.2, v10.6.3, v10.6.4, v10.6.5, v10.6.6, or v10.6.7 to v10.6.8.

This article has been archived and is no longer updated by Apple.

Important: Read before installing. 

  • Do not interrupt the installation process. If a power outage or other interruption occurs during installation, use the standalone installer (see below) from Apple Support Downloads to update.
  • The Mac OS X Server v10.6.8 Combo Update overwrites the /etc/rc.server file. If you have previously made changes to this file, make a backup copy before updating. Any custom sysctl settings should be configured in /etc/sysctl.conf rather than /etc/rc.server. See man rc.server and the /etc/sysctl.conf.default file for details.
  • You may experience unexpected results if you have third-party system software modifications installed, or if you've modified the operating system through other means. (This does not apply to normal application software installation.)
  • This update can be installed on non-startup volumes, but you should only do this if the current startup volume has already been updated to Mac OS X Server v10.6.8. The simplest way to avoid issues from an improper installation is to start up from the volume that you wish to update.


There are three ways to update to Mac OS X Server v10.6.8:

  • Use Software Update
  • Install from a standalone installer
  • Install on a remote server via the softwareupdate command-line utility

Software Update installation

Software Update may have referred you to this article. Because some updates are prerequisites for others, you may need to use Software Update more than once to obtain all available updates.

Standalone installer

If you want to download and manually install the update, an installer is available from Apple Support Downloads. This a useful option if you need to update multiple computers but only want to download the update once.

Remote installation

If you need to install the update on a remote server, you can do so using screen sharing, Apple Remote Desktop or the softwareupdate command-line tool.

What's included?

This update includes improvements listed below, as well as ones delivered with the Mac OS X Server version 10.6.1, 10.6.2, 10.6.3, 10.6.4, 10.6.5, 10.6.6, and 10.6.7 updates.

Calendar Service
  • Improves reliability of processing international character encodings.
  • Improves authentication support for iOS devices.

Directory Services

  • Improves reliability of Directory Services when bound to an Active Directory domain.
  • Ensures correct authentication when Lion Server is bound to a Mac OS X v10.6 Snow Leopard Open Directory master.

Mail Services

  • Improves reliability of vacation notice delivery.

Server Admin

  • Adds NetBoot/NetInstall model filters for iMac (Early/Mid 2011) models.

Software Update Service

  • Previous software updates can now be properly enabled in Server Admin.
  • Improves reliability of cascading Software Update servers.

System Image Utility

  • A Mac OS X v10.6.8 NetBoot, NetInstall, or NetRestore image can be used on all Macs that support Mac OS X v10.6 Snow Leopard, as long as the image is created using the Mac OS X v10.6.8 combo update. For details, see this article.
  • Adds NetBoot/NetInstall model filters for iMac (Early/Mid 2011) models.

Time Machine

  • Improves reliability of hosting Time Machine backups for clients.

Wiki Service

  • Fixes an issue in Mac OS X Server v10.6.7 that prevented movies on wiki pages from playing properly in Firefox and Internet Explorer.

Additional improvements

  • Improves Mac OS X Server security. For more information about the security content of Mac OS X Server v10.6.8 see this article.
  • Mac OS X Server v10.6.8 also includes all other improvements delivered in the client Mac OS X v10.6.8 Update.

The Mac OS X Server v10.6.8 Supplemental Update addresses excessive CPU usage by the hwmond process when certain USB devices are connected to your server.

The Supplemental Update is recommended if you installed the Mac OS X Server 10.6.8 Update (v1.0). It is not needed if you install the Mac OS X Server Update 10.6.8 v1.1.

Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple’s recommendation or endorsement. Please contact the vendor for additional information.
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