Event ID - 8168

Event Id8168
DescriptionCould not modify user/group: <object name>. <connection agreement name>
Event InformationAccording to Microsoft:
This issue occurs because the Recipient Update Service encounters a distribution list/distribution group that has its membership hidden. When the Recipient Update Service encounters one of these distribution lists, it logs an error in the Application event log, and then goes to sleep for 30 minutes. After the 30 minutes have elapsed, the Recipient Update Service tries to update the distribution group again.
To resolve this issue, give the Exchange Enterprise Servers group the appropriate rights. To do this, follow these steps:
1. Start the Active Directory Users and Computers snap-in.
2. Click View, and then ensure that the Advanced Features check box is checked.
3. Right-click the domain object and click Properties.
4. Click the Security tab. 5. In the Name box, click the Exchange Enterprise Servers group.
6. Click the Advanced button.
7. Scroll down and click the entry for the Exchange Enterprise Servers group that has Special permissions which apply to group objects.
8. Click the View/Edit button.
9. Locate the Modify Permissions attribute and click to select the check box in the Allow column.
10. Click OK until all the windows are closed.
Reference LinksXADM: Recipient Update Service Stops Responding with Event ID 8022

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