We are using a mac mini with os x server installed on it. Since 3 days we can't login no more to access the files on it (via Finder > shared). We can share the screen of our server and when we open the server.app it seems like we have lost our network users. This is rather strange since we haven't changed anything. But our 3 network users are gone and we can't add no more users in general. We tried restarting a couple of time, restarting services and we looked at our ip/dns settings but we haven't change anything on our ip/dns so that should still work as before, but it doesn't.
Does someone has a clue on how we lost our network users en why we can't add users?
Our server info: System version: OS X 10.8.4 Server version: Server 2.2.1