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A System Center Operations Manager 2007 Gateway Server may have problems communicating with its Management Server. You may also see the following events on the Gateway Server:
Log Name: Operations Manager Source: OpsMgr Connector Date: <date><time> Event ID: 21016 Task Category: None Level: Error Keywords: Classic User: N/A Computer: <gateway-server> Description: OpsMgr was unable to set up a communications channel to <gateway-server> and there are no failover hosts. Communication will resume when <gateway-server> is available and communication from this computer is allowed.
Log Name: Application Source: MsiInstaller Date: <date><time> Event ID: 11707 Task Category: None Level: Information Keywords: Classic User: <user> Computer: <gateway-server> Description: Product: System Center Operations Manager 2007 R2 Agent -- Installation operation completed successfully.
http://support.microsoft.com/default.aspx?scid=kb;en-us;2004886
Full Title: Communication between a System Center Operations Manager 2007 Gateway Server and Management Server fails when the Agent is installed on the Gateway Server
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