This query also fails. When you hardcode the Active Directory Site name, Windows will return the hardcoded site name in response to the query from Exchange. On a Windows Server R2-based server, this operation sometimes fails. With as a result clients have no connectivity and those errors that initially make you think you could have DNS issues, AD problems etc. Locate the following registry subkey: The causes of this lookup failure include, but are not limited to, the following: To do this, follow these steps:
Warning Depending on the function of the Exchange Server server, restarting the MSExchange ADTopology service may result in an unplanned outage, and other services may have to be restarted. This behavior enables Exchange server to bypass any site name lookup failures. Additionally, Exchange Services performs a query for its Active Directory Site during the startup process. Well this is where they provide only what I already knew: Windows will continue to try and determine its AD Site name and will eventually succeed. However, Exchange does not retry the query, and the errors that are mentioned in the Symptoms section are logged in the Application log every 15 minutes. With as a result clients have no connectivity and those errors that initially make you think you could have DNS issues, AD problems etc. When you hardcode the Active Directory Site name, Windows will return the hardcoded site name in response to the query from Exchange. Make sure that Exchange server is correctly registered on the DNS server. To work around this issue, hardcode the Active Directory Site name in the registry. You may also see a NetLogon error of in the Application log. I also remember happening this to me once before somewhere in February with another setup of Exchange on Windows R2. When you search those errors you can find a TechNet article describing a possible cause: As the Exchange services are starting, it also will do a query for its AD Site and that too will fail. But since I build those Exchange setups myself I just know they are close to godliness both in design and implementation: The causes of this lookup failure include, but are not limited to, the following: Transient DNS failures Transient issues with Domain Controllers Transient network connectivity issues Network switches that have the PortFast functionality disabled on the ports to which the Exchange servers connect Windows will continue to try to determine its Active Directory Site name and will eventually succeed. Exchange, tries to get the AD Site information once, fails and keeps thinking there is an issue. Type SiteName, and then press Enter. Overview of Active Directory Troubleshooting. Checking that has become a second nature on multi homed and clustered servers. Now Windows retries and is OK after a while. This query also fails. Locate the following registry subkey: Back then the issue went away by restarting the server, restarting the MSExchange ADTopology Service will do however, and the problem never came back. On a Windows Server R2-based server, this operation sometimes fails. Exit Registry Editor, and then restart the computer to apply the change.
Video about process msexchangeadtopology when updating security for a remote procedure call:
What is REMOTE PROCEDURE CALL? What does REMOTE PROCEDURE CALL mean?
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