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Event ID: 9057 Source: MSExchangeSA

NSPI Proxy cannot contact any Global Catalog that supports the NSPI Service. New clients will be refused until a Global Catalog is available. After a Domain Controller is promoted to a Global Catalog, it must be rebooted to support MAPI Clients.
As per Microsoft: "This event indicates that the Name Service Provider Interface (NSPI) Proxy cannot contact any global catalogs that support the NSPI Service. New clients will be refused until a global catalog is available. A domain controller that was recently promoted to a global catalog may not have been restarted. A global catalog must be restarted in order for the NSPI interface to be available". See MSEX2K3DB for additional information about this event.
The connection to Global Catalog Server is not available, or GC is down.

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