| Event Id | 8020 |
| Source | MSExchangeAL |
| Description | LDAP Search of directory <directory name> at base <object name> using filter <value> was unsuccessful. Directory returned the LDAP error:[0x<error code>] <error message>. <connection agreement name> |
| Event Information | According to Microsoft: CAUSE: LDAP queries are used in filter rules to specify the recipient membership of address lists and recipient policies. A malformed filter can cause the Recipient Update Service not to process the recipient membership policy. This causes new user account attributes to not update as expected. New users also cannot access their Exchange mailboxes nor send and receive e-mail messages. RESOLUTION: To resolve this problem, correct or remove the LDAP query that is failing. The "More Information" section contains lists of events to help you locate the incorrect filter. |
| Reference Links | An LDAP filter error causes the Exchange Recipient Update Service not to stamp newly created users |
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