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Event ID: 20481 Source: LiveCommunicationsServer

Level
Description
Server could not register for notifications for configuration changes for a class from the WMI Provider.

Class: MSFT_SIPProxySetting
Cause: This could happen in some instances due to insufficient permissions or because the server is unable to contact the Active Directory (or SQL backend).
Resolution: Please make sure you have sufficient privileges and this machine can talk to the Active Directory (or SQL backend).
Comments
 
Install LCS SP1 and wait for AD replication.

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