I would like to let me users be able to change their own password thru the webinterface.

I've 10.5.1 server installed and I tried 3 different techniques that worked in the past;

MOSXSWebPassword 1.5

But all of them give me a authentication error.
I can change the userpassword with WorkGroupmanager without problems.

Anyone got any suggestions or a guide how to get this feature to work under leopard again?