Event ID - 8021

Event Id8021
SourceMSADC
DescriptionLDAP Add on directory <directory name> for entry <object name> was unsuccessful with error:[0x<error code>] <error message>. <connection agreement name>
Event InformationAccording to Microsoft:
CAUSE:
This problem can occur if the ADC does not correctly import two Exchange Server 5.5 DLs when the DL alias names are similar.
RESOLUTION:
To resolve this problem, obtain the latest service pack for Microsoft Exchange 2000 Server.

This information from some news groups may help you:
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If the accompanying Lightweight Directory Access Protocol (LDAP) message refers to LDAP_OTHER, the directory service may be out of disk space.Check network connectivity. Verify the user name, password, and port address are correct, and try again.
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Reference LinksXADM: The Second DL in a Batch Does Not Replicate from Exchange Server 5.5 to Exchange 2000

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