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Users cannot log on to one of our domain controllers

I have two sites. I put my main domain controller with AD and DNA at the primary site and an additional domain controller (DC) at the other site with DNS. Both the sites were connected with high-speed link. I gave both the DCs global catalog role for fault tolerance. But when the link was down, none of my users were able to log on to the other site where I kept the additional domain controller. All of my clients are either NT or Windows 98. What is the problem in authenticating and how do I solve this?
Make sure that one DC in each site is a global catalog (GC) server, as your clients will not be able to log on without access to the GC. (See this article for instructions on enabling a controller to be a GC.) Also make sure that you have WINS running in both locations, as NT and 98 clients require NetBIOS for name resolution.

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