| Event Id | 9154 |
| Source | CDOEXM |
| Description | DSACCESS returned an error <error code> on DS notification. Microsoft Exchange System Attendant will re-set DS notification later. |
| Event Information | "According to Microsoft: Explanation : This event is displayed in the application log when the Exchange server is unable to access a domain controller. For example, this event can occur when a domain controller is restarted, if that is the ONLY domain controller in the site to which the Exchange server belongs. The most probable cause for this event is that the Kerberos ticket timed out. This typically happens in a topology that has a single domain controller. When the Kerberos tickets that are associated with the Lightweight Directory Access Protocol (LDAP) connections time out, all LDAP connection attempts show errors because the security contexts have failed. These connections must be re-established. Because there is only one domain controller in this topology, there are no other servers to obtain a ticket from while this re-establishment takes place. Therefore, the error occurs. Incorrect Domain Name System (DNS) configuration. User Action: a. The client LDAP connections should get re-established automatically and the errors should go away once this re-establishment has taken place. It is recommended that additional domain controllers be installed in the site in order to avoid such errors. b. Ensure that both the Primary and Alternate DNS servers listed in the Exchange Server IP Properties are up and running and have been configured properly. c. Check the domain controller to ensure that it is running properly. For example, ensure that is not restarting unnecessarily." |
| Reference Links | Event id 9154 from source CDOEXM |
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