Event ID - 9144

Event Id9144
SourceCDOEXM
DescriptionNSPI Proxy failed to connect to Global Catalog <server name> over transport <name>. This server is down or unreachable.Clients will not be directed to this GC until it is available again.
Event InformationAccording to Microsoft:
Explanation :

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.
The global catalog server could be unreachable due to network connectivity issues.
The following registry key could be present:
HKEY_LOCAL_MACHINE\Systems\CurrentControlSet\Services\NTDS\Parameters\Initialize MAPI interface
Value: REG_DWORD
Data Value: 0
User Action :
I. Ensure that the global catalog is up and running and reachable.
II. Delete the registry key identified in the Explanation section, if present.
Reference LinksEvent id 9144 from source CDOEXM

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