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Event ID: 9144 Source: MSExchangeSA

Source
Level
Description
NSPI Proxy failed to connect to Global Catalog server.domain.com over Tcp/Ip. This server is down or unreachable. Clients will not be directed to this GC until it is available again.
Comments
 
As per Microsoft: "This event indicates that the Exchange server was unable to contact a global catalog server. This is not critical (which is why it is only a warning event). If there is another global catalog in the site, Exchange will use that global catalog". See MSEX2K3DB and ME812855 for information about this event.
The global catalog server in which the exchange server is trying to contact is offline. Bring the server back online and exchange will then service the clients.

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