I found when trying to authenticate with the Wiki service or Blog service on OS X 10.5 server i was unable to login with an active directory account. After search through the net and trying and testing a solution I found its all working. The problem was with using clear text passwords. This can of course create a issue security so if you feel security is of highest importance then I would suggest using SSL to secure the traffic transfered from your server to client.
Solution
In order to authenticate Active Directory users and/or users stored in other third-party LDAP servers, you must enable clear text authentication for wikid. Note: In order to prevent sending passwords in the clear across the network, it is recommended that you also configure the wiki server for SSL.
Enabling clear text authentication for wikid
Open Terminal and type these commands on one line each:
sudo serveradmin settings teams:enableClearTextAuth = yes
sudo serveradmin stop teams
sudo serveradmin start teams
Taken from http://support.apple.com/kb/TS1619

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I found when trying to authenticate with the Wiki service or Blog service on OS X 10.5 server i was unable to login with an active directory account…..