About the Mac OS X Server v10.6.3 Update

This software updates Mac OS X Server v10.6, v10.6.1, or v10.6.2 to v10.6.3.

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 v10.6.3 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 v10.6.3. 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 version 10.6.3:

  • Use Software Update
  • Install from a standalone installer
  • Install on a remote server via Server Admin or 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 the Server Admin application 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 and 10.6.2 updates.

Calendar Service

  • Improves compatibility with clients that use non-Roman languages.

Client Management

  • Mail and iCal accounts that are automatically created when a client joins a server can now be deleted in Mail and iCal without unbinding from the server. Similarly, automatic VPN configurations can be removed from the client without unbinding.

Directory Service

  • Fixes an issue that could cause the system to become unstable or unresponsive when bound to an LDAP server via SSL.
  • Improves reliability of the slapd process on servers that are backed up by Time Machine.
  • Improves importing records from older Open Directory servers.

Mail Service

  • Allows the Mail service to recover from an interruption in Directory Services and reduces Mail service memory usage. (This was previously included in Mail Services Update 1.0 for Mac OS X Server v10.6.2.)
  • Improves Mail service stability.
  • Improves Mail encryption, as described in this article.
  • Fixes an issue that caused Spamassassin to incorrectly adds 3.2 points to any message sent on or after Jan 1, 2010, as described in this article.

Podcast Producer

  • Improves stability and reliability of Podcast Capture.
  • You can now capture audio-only podcasts without a video device attached.
  • The podcast command now accepts the --transfer_method option, which can be used to submit jobs by moving or copying files from the local filesystem instead of POSTing the files via HTTP. For details, see the man page for the podcast command.
  • Improves time synchronization between cameras when capturing dual-source video.
  • Improves performance and stability of Podcast Capture Web application when used with a large camera list.
  • Improves appearance of thumbnails for podcasts posted to a wiki, when viewed with Internet Explorer.
  • Updates and improves man pages for Podcast-related command-line tools.

Server Admin

  • Eliminates delays in Server Admin on an IPv6 network.
  • "Edit Over Quota Error Message" button is now always enabled for the Mail service.
  • You can now stop the NetBoot service without stopping the DHCP service first.
  • NetBoot/NetInstall filtering by client MAC address now works.
  • Adds NetBoot/NetInstall model filter for the iMac (27-inch, Late 2009).

Software Update Service

  • Improves reliability of Software Update Service, fixing the issues described in this article.
  • Provides the ability to selectively copy and enable updates from Apple when there are updates with the same name for different Mac OS versions, such as Safari 4.0.4 for Leopard and Snow Leopard.
  • Software Update service can now connect to Apple's Software Update servers through a proxy server that does not require authentication. For more information, see this article.
  • Fixes cascading Software Update servers, which can be set up using the instructions in this article.

System Image Utility

  • Fixes an issue that could generate the message "Catalog file is too fragmented for restore" when creating a NetRestore image from a volume.
  • When using the Add Packages and Post-Install Scripts task, you can now specify the order of the added packages and scripts.
  • You can now create a NetRestore image that includes a package such as iTunes, which would previously prevent the new disk image from being unmounted during creation.
  • The Customize Package Selection workflow now works when the primary language is other than English.
  • Adds model filter for the iMac (27-inch, Late 2009).
  • Improves the ability to add Software Update packages and other installation packages to a NetInstall workflow (requires a source volume with Mac OS X v10.6.3 or later installed).
  • You can now Enable Automated Installation for a NetRestore image (requires a source volume with Mac OS X v10.6.3 or later installed).
  • Fixes an issue that could cause systems created from a NetInstall image to show an alert that "the client computer already exists" when binding to an Open Directory server (requires a source volume with Mac OS X v10.6.3 or later installed). For details, see this article.
  • Fixes an issue with setting a custom system name using the Apply System Configuration Settings task (requires a source volume with Mac OS X v10.6.3 or later installed).
  • When you enable Automated Installation for a NetInstall image, clients can now successfully choose which volume to install on if the "Volume: Selected by user" option is set (requires a source volume with Mac OS X v10.6.3 or later installed). 

Web Service

  • Enables CGI scripts stored in the /Library/WebServer/CGI-Executables/ directory.
  • Web password reset and mail rules pages now work with Internet Explorer.
  • Web password reset uses port 8096 to avoid a conflict on port 8088 with the Software Update service.

Wiki Service

  • Adds Digest-MD5 authentication support for Active Directory users.
  • RSS feeds now include wiki updates.
  • You can now attach files that have symbols such as # & ?, high-ASCII characters, or 2-byte language characters in their name. 2-byte characters are used to represent Japanese, Chinese, and Korean characters. High-ASCII characters are "extended ASCII" characters such as ü or é.
  • Improves moving and opening events on a wiki calendar from Internet Explorer.
  • Improves compatibility for Safari on iPad.

Workgroup Manager

  • Fixes an issue that could cause a user's primary shortname to be changed when adding or editing additional shortnames.


  • Improves reliability of Fibre channel connections to an Xserve RAID.
  • Fixes an issue that could cause the size of certain Fibre channel LUNs to be reported inaccurately.

Additional improvements

  • Improves Mac OS X Server security. For more information about the security content of Mac OS X Server v10.6.3 see this article.
  • Mac OS X Server v10.6.3 also includes all other improvements delivered in the client Mac OS X v10.6.3 Update.

In order to receive all the improvements listed above, some systems require the Mac OS X v10.6.3 Supplemental Update, which is available via Software Update.

Tip: If you don't see the Mac OS X v10.6.3 Supplemental Update in Software Update, you don't need to install it.

Note: The Supplemental Update is for any system that was updated from Mac OS X Server v10.6 using the Mac OS X Server Update Combined v10.6.3, build 10D573. It is not needed on systems that were updated from Mac OS X Server v10.6.1 or 10.6.2, and it is not needed on systems that were updated from Mac OS X Server v10.6 using the Mac OS X Update Combined v10.6.3, v1.1.

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