Can't authenticate to directory server

I can't authenticate to my directory server from another machine.

My directory server is running on RedHat ES4.  I am trying to use
Secure authentication (NTLM?) from a Windows C# .NET application. 
I suspect my problem is one of incorrect configuration on the directory
server side.  

I can access the directory server from the Windows app using anonymous access.

I created a user in the directory server and added that user to the
Directory Administrators Group's ACI.  I also added the IP address
of the machine I am trying to communicate from to the Hosts list in the
Directory Administrators Group ACI.

I can login to the console using my user
(uid=mont,ou=people,dc=foray,dc=com) on my Linux server.  I have
tried logging in from the Windows app using both the full RDN and
simply the user name "mont".  Neither work.

Any ideas as to what needs to be done to enable authentication from a remote machine would be greatly appreciated.

Thanks,
-Mont