image Let’s say you’ve got a mixed version (SP1 and R2) Operations Manager 2007 environment and agents are commonly multi-homed.  This works and is supported to enable a phased upgrade approach.

However, if you’re planning to multi-home new agents in this mixed version environment and you’re using the Discovery Wizard, be sure to first discover and install the agent in the SP1 Management Group first.  If you discover and install the agent in the R2 Management Group first, the Discovery Wizard will fail in the SP1 Management Group because the R2 version of the agent will already be installed (downgrades via the wizard are not possible).

The Discovery Wizard will return something like this:

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If you have already discovered and installed the agent in the R2 Management Group, you’ll need to modify the agent installation locally in Add or Remove Programs.

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Here’s the actual text, to facilitate searching this post.

The Agent Management Operation Agent Install failed for remote computer computername.opsmgrlab.com.
Install account: OPSMGRLAB\administrator
Error Code: 80070643
Error Description: Fatal error during installation.
Microsoft Installer Error Description:
For more information, see Windows Installer log file "C:\Program Files\System Center Operations Manager 2007\AgentManagement\AgentLogs\computernameAgentInstall.LOG
C:\Program Files\System Center Operations Manager 2007\AgentManagement\AgentLogs\computernameMOMAgentMgmt.log" on the Management Server.

Hope this helps,

Jonathan Almquist | Microsoft Premier Field Engineer