Event ID - 8021

Event Id8021
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:
This problem can occur if the ADC does not correctly import two Exchange Server 5.5 DLs when the DL alias names are similar.
To resolve this problem, obtain the latest service pack for Microsoft Exchange 2000 Server.

This information from some news groups may help you:
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.
Reference LinksXADM: The Second DL in a Batch Does Not Replicate from Exchange Server 5.5 to Exchange 2000

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