Event ID - 9057

Event Id9057
SourceMSExchangeAdmin
DescriptionNSPI Proxy cannot contact any Global Catalog that supports the NSPI Service.New clients will be refused until a Global Catalog is available.
Event InformationAccording to Microsoft:
Cause:

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 DC that was recently promoted to a GC may not have been restarted. A GC has to be restarted in order for the NSPI interface to be available.
User Action :
Check the general health of the global catalog servers.
If you have recently promoted a Domain Controller to Global Catalog, recall that it must be rebooted in order to support MAPI clients.
Reference LinksNSPI Proxy cannot contact any Global Catalog that supports the NSPI Service.

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