Active Directory Error

I am attempting to modify a User ID via the Account tab (the fields of Windows 2000 Login, Pre-Windows 2000 Login and the drop-list next to the Windows 2000 Login field).  When I click Apply after making the changes/additions the following error appears: "Unable to verify that the user logon name does not already exist in the enterprise.  The global catalog search returned the error: The search filter cannot be recognized."   What does this error mean?   Thanks.
scottlieberman74Asked:
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rhinocerosConnect With a Mentor Commented:
Your global catalog server is disconnected ? How many DCs you are using ?



More Info:

Global catalog server failure

When you create a domain within a forest, then the first domain controller within that domain is designated as a global catalog server. Windows uses the global catalog to help it to locate objects within the Active Directory. A global catalog failure is a serious problem though. If your global catalog server goes down, then nobody except for the Administrator will be able to log in until the global catalog server becomes available again.

The easiest way to prevent a global catalog server failure from causing a major disruption to your network is to designate a second domain controller to act as a global catalog server. To do so, open the Active Directory Sites and Services console and navigate through the console tree to Active Directory Sites and Services | Sites | Default First Site Name | Servers | the server that you want to set as a global catalog server | NTDS Settings. Next, right click on the NTDS Settings container and select the Properties command from the resulting shortcut menu to reveal the NTDS Settings Properties sheet. Select the Global Catalog check box and click OK.
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