Event ID - 21171

Event Id21171
SourceOnePoint Operations
Description"The Agent Manager was unable to determine the Primary Domain Controller for domain MOMDOM.MICROSOFT.COM while resolving the Managed Computer Rules. This domain will not be processed.
Event InformationAccording to Microsoft:
CAUSE: 1
This behavior occurs because the MOM Agent Manager does not recognize FQDNs for domains that are to be scanned.
Cause 2:
This error message appears because the Agent Manager is unable to identify the primary domain controller (PDC) for the domain while the Agent Manager is resolving the Managed Computer rules
RESOLUTION:
To work around this behavior, use the NetBIOS name for the domain that you want to scan.
or
To work around this issue, add the agents name to the following file
InstallDir\OnePoint\ManualMC.txt
where InstallDir is the installation directory of Microsoft Operations Manager (MOM).
Reference Links"Agent Manager Does Not Recognize Fully Qualified Domain Name

Error Message Appears When You Add Computer That Is Outside of Firewall to Managed Computer Rules

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