AD LDS - The specified directory service attribute or value does not exist

I have an interesting one.  If I run AD LDS on the same box as SharePoint and leverage an LDAP provider, I'm getting "the specified directory service attribute or value does not exist" when attempting to resolve a directoryEntry based on search parameters.  However, if I point the same LDAP provider to a remote machine with AD LDS, I have no issues searching for DirectoryEntries.  Permissions on the AD LDS instances, as far as I can tell, are identical.  The Application Pool that is making the call is either present in the User or Administrator role (for testing purposes).

I noticed, however, that when I passed a username and password through my provider (using my own credentials), the search of the localhost AD LDS instance functioned.

This is the code path difference:

            if (username != string.Empty && password != string.Empty)
            {
                directoryEntry.AuthenticationType = LdapAuthentication(useSSL);
                directoryEntry.Username = username;
                directoryEntry.Password = password;
            }
            else
            {
                directoryEntry.AuthenticationType = LdapAuthentication(useSSL);
            }

LdapAuthentication simply returns AuthenticationType.Secure in this case.

SharePoint - Nauplius Applications
Microsoft SharePoint Server MVP
MCITP: SharePoint Administrator 2010

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This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.