How to set Agent proxy enabled for all agents in SCOM 2012

Here is an updated PowerShell script that can be used to set agent proxy in SCOM 2012.

param ($MSSvr)
Import-Module -Name "OperationsManager"
New-SCManagementGroupConnection -ComputerName:$MSSvr;

## set proxy enabled for all agents where it is disabled
$NoProxy = get-SCOMagent | where {$_.ProxyingEnabled -match "False"}
$NoProxy|foreach {$_.ProxyingEnabled=$true}
$NoProxy|foreach {$_.ApplyChanges()}