Cannot login to network accounts from client computer

Hi. I'm setting up my first OS X Server setup for home use...I'm not creating a very complicated setup, but I've been working through the setup one step at a time.

Right now, I'm just running the DNS, File Sharing, and Open Directory services. I setup a couple of Network User accounts, and I wanted to try using one of the accounts to log in to a Mac client (running Mountain Lion) on the network. When the machine first comes up, I get a message that says 'Network Accounts Unavailable,' and if I try to log in, I get the error message saying 'You are unable to log in to the user account "xxxxx" at this time. Logging in to the account failed because an error occurred.'

If I stop and restart the Open Directory service, I get the following messages in the Open Directory Log:

2013-02-15 09:11:01.017801 EST - Unregistered node with name '/LDAPv3/127.0.0.1'

2013-02-15 09:16:19.139744 EST - Registered subnode with name '/LDAPv3/127.0.0.1'

Not sure if this is the source of the problem, but these are the only messages that are coming up if I turn the Open Directory off and then on again.

If anyone has any experience with this, or any suggestions, I'd greatly appreciate it!

Thanks!

If it helps:

Running OS X Mountain Lion (10.8.2) with Server (v2.2.1)

Client Machine is a VMWare Fusion VM Running Mountain Lion (10.8.2)