Event ID - 8011

Event Id8011
DescriptionSearching directory <directory name> at base <value> using filter <value> and requesting attributes <attribute name>. <connection agreement name>
Event InformationAccording to Microsoft:
To do this, follow these steps:
1. Start the Exchange System Manager tool.
2. If administrative groups are enabled, expand Administrative Groups, and then expand your administrative group. If administrative groups are not enabled, go to step 3.
3. Expand Servers, right-click the Exchange server that you want to configure diagnostic logging on, and then click Properties.
4. Click the Diagnostics Logging tab, and then click MSExchangeAL in the Services list.
5. In the Categories list, click LDAP Operations, click Maximum, click Address List Synchronization, and then click Maximum. If you are running Exchange 2003, go to step 6. If you are not running Exchange 2003, go to step 7.
6. Click MSExchangeSA in the Services list, click Proxy Generation in the Categories list, and then click Maximum.
7. Click OK.
After you have selected a domain RUS to troubleshoot, and after you have increased diagnostics logging on the Exchange server that handles the domain RUS that you want to troubleshoot, you must select an object to use to test the RUS. For example, test the RUS by using a user account that the RUS has not stamped. You can then view the actions that the RUS performs on this object.
In these events, the only RUS objects are the Enterprise RUS and one domain RUS. Therefore, the search returns two objects. If this search returns no results, your Exchange server does not see the RUS objects. This behavior may occur because a permissions problem exists. If the Exchange server cannot see a RUS object, the Exchange server cannot determine that it is responsible for that RUS object. In this scenario, the RUS will never process any objects. However, even if the Exchange server does not detect any RUS objects, event ID 8011 and event ID 8012 will appear frequently. This behavior occurs because Abv_dg.dll frequently searches for the existence of RUSs. If event ID 8011 and event ID 8012 do not appear in the Application log after
Reference LinksHow to troubleshoot the Recipient Update Service by using the Application log in Exchange 2000 Server or in Exchange Server 2003

An LDAP filter error causes the Exchange Recipient Update Service not to stamp newly created users

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