Bob Cornelissen couldn’t locate a SCOM 2007 option in SCOM 2012 for enabling the agent proxy for all managed machines, so he wrote a one-line PowerShell command to accomplish the task.
The PowerShell one-liner:
Get-SCOMAgent | where {$_.ProxyingEnabled.Value -eq $False} | Enable-SCOMAgentProxy
Read Bob’s full post, which describes what the script does and gives some important notes on using it: SCOM 2012 enable agent proxy for all machines

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