On a Windows 7 SP1 workstation, During the login process, after Novell login has succeeded but during Zenworks login we are receiving the following error:

Windows Security Message
Unable to log into the network because the login credential are incorrect

We have an EDIR tree which is authoritive source and partially (not all attributes) synched with and AD tree.

We have worked around this in the past by changing the AD password for the user to match the EDIR password.
This however is not an option for the 1000 users that will be effected soon.

I have tried using a DLU but it does not appear to have any effect. Should a DLU be able to fix this !, or is there something else I have missed.

The workstations in question will be used by many different users.

Thank you in advance for your assistance.