About the Mac OS X Server 10.5.6 Update

This software updates Mac OS X Server versions 10.5, 10.5.1, 10.5.2, 10.5.3, 10.5.4, or 10.5.5 to 10.5.6.

This article has been archived and is no longer updated by Apple.

Important: Read before installing.

  • The installation process should not be interrupted, even if the progress bar remains unchanged for several minutes. If a power outage or other interruption occurs during installation, use the standalone installer (see below) from Apple Support Downloads to update.
  • You must have an administrator account password that does not contain spaces or Option-keyed characters to install this update. The password may not be left blank. If you need to change your password, see this article.
  • 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 version 10.5.6. The simplest way to avoid issues from an improper installation is to start up from the volume that you wish to update.
  • You may get unexpected results if you've installed third-party system software modifications, or if you have modified the operating system through other means. (This doesn't apply to normal software installation.)
  • If you are running Mac OS X Server as a guest OS in VMware Fusion, contact VMware for compatibility information before installing this update.
  • If you are installing Mac OS X Server on a Mac Pro (Early 2009), make sure that you install the Mac OS X Server 10.5.6 Update v1.1.


There are three ways to update to Mac OS X Server version 10.5.6:

  • 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 document. For more information on this feature, see 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 necessary update once.

Note: There are two separate standalone installers. The Mac OS X Server 10.5.6 Update is for installation on Mac OS X Server version 10.5.5 only. The Mac OS X Server 10.5.6 Combo Update can be installed on Mac OS X Server versions 10.5, 10.5.1, 10.5.2, 10.5.3, 10.5.4, 0r 10.5.5.

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 10.5.1, 10.5.2, 10.5.3, 10.5.4, and 10.5.5 updates.

File Services

  • Improves performance and reliability of Apple File Service.
  • Spotlight provides more reliable results when remote users search a server volume with Spotlight searching enabled. Important: This change takes effect when you enable Spotlight searching on a sharepoint. In order to take advantage of this improvement on a sharepoint where you have already enabled Spotlight searching, disable Spotlight searching, save, re-enable Spotlight searching, and save again. The sharepoint will remain online during this process, but Spotlight searching will be unavailable for a short time while the index is rebuilt.
  • Fixes an issue that could make NFS exports unavailable at server startup.

Podcast Producer

  • Podcast Producer now supports Digest-MD5 authentication, for improved compatibility with Active Directory users, and Kerberos authentication for single sign-on.
    : In order to use Single-Sign On in Podcast Capture, you must explicitly select that Authentication Type option in Preferences. For more information about enabling Single-Sign On for the Podcast service in an Open Directory environment, click here. For more information about enabling and disabling authentication methods on the server, see this article.
  • Improves reliability of camera connections.

Password Server

  • Improves performance of Password Server replication.

System Imaging

  • When deploying a system image created from a volume, the target computers will no longer have identical local KDC files. For more information, see this article.
  • Added NetBoot/NetInstall model filters for recent MacBook, MacBook Pro, and MacBook Air computers.

Server Admin

  • Fixes an issue that could cause Server Admin to stop responding when propagating permissions on a folder which is on a volume other than the boot volume.

System Performance and Reliability

  • Improves overall system reliability.
  • Improves performance and reliability of TCP connections.
  • Fixes an issue that could occur when ejecting a volume on a Promise VTrak RAID.
  • Improves reliability of RAID Utility

Addtional improvements

  • Improves Mac OS X Server Security. For more information about the security content of Mac OS X Server 10.5.6 see this article.
  • Mac OS X Server 10.5.6 also includes all other improvements delivered in the Mac OS X 10.5.6 Update (client update).


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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