The only info for it I can find is this...
The 10.5.6 update is recommended for all servers running Leopard Server. This update includes general operating system fixes, as well as specific fixes for:
- directory service reliability and authenticating new File Sharing connections
- binding and authentication in Active Directory environments
- editing Wiki content in Safari, Firefox and Internet Explorer
- viewing Wikis and Blogs from an iPhone or iPod touch
- searching with Spotlight in the Finder and on the web
- sending 'Welcome' email messages to users in Server Preferences
- importing users and working with nested groups in Server Preferences
- updating DNS information when server IP address changes occur
- hosting DHCP services
- supporting private events in iCal
- synchronizing Portable Home Directories
- enabling Software Update Server
- using SNMPv3 services
- hosting with WebObjects; update to version 5.4.3
- preventing mail server database corruption
- hosting mail services for users with long user names
- ensuring security of LDAP password hashes
- propagating password changes to Open Directory replicas
- creating and editing DNS records in Server Admin
- using System Image Utility to create NetBoot and NetInstall images
- creating augment directory records in Advanced server configuration
- using Managed Preferences when clients are bound to Active Directory
- providing RADIUS authentication to 802.11n-enabled AirPort Base Stations
- authenticating Podcast Producer with Open Directory and Active Directory
- reducing replication times for new Open Directory accounts and password changes
- propagating file system permissions when using Server Admin
- enforcing management of Screen Saver settings on certain client systems
- client management of printers and print queues
- reliably using NFS shares with linked binaries
- ejecting and remounting HFS+ formatted Fibre Channel LUNs
For detailed information on this update, please visit this website:
http://support.apple.com/kb/HT3192.
For detailed information on security updates, please visit this website:
http://support.apple.com/kb/HT1222.