How can I enable computer only logon even when an active network connexion exists and passive login is used? (see TID 7009517).

In my case, I always have to log to eDir after login with a windows local account. This Windows account does not exist on eDir and I cannot tell the Novell Client to use the local user instead (no Computer logon only is diplayed).
Novell Client is configured to use passive login.

Thanks in advance.