Unable to login to local network users from server

Hello,

I've just set up a 10.8 server from scratch (blank machine, installed 10.8, update to 10.8.1, install Server, that's all).

I've set up Open Directory, activated file sharing, and added a new local network user.

While I can perfectly login to this user on the other macs, I can't do it on the server.

When I look into /Network/Servers/mac-server.local/Users on the server, the folder is empty, so I can understand why the user can't log in, but I can't understand why thats so.

Any thought?