added note about proxy

Author: johnmarco

articles/azure-arc/servers/onboard-group-policy.md

@@ -52,6 +52,9 @@ The group policy will project machines as Arc-enabled servers in the Azure subsc
 
 Before you can run the script to connect your machines, you'll need to save the onboarding script to the remote share. This will be referenced when creating the Group Policy Object.
 
+> [!NOTE]
+> If you're using a proxy server, you'll need to modify the Invoke-WebRequest command in the script to include the Proxy parameter and url. For example, `Invoke-WebRequest -Uri "https://aka.ms/azcmagent-windows" -Proxy "http://xx.x.x.xx:xxxx -TimeoutSec 30 -OutFile "$InstallationFolder\install_windows_azcmagent.ps1"`
+
 <!--1. Edit the field for `remotePath` to reflect the distributed share location with the configuration file and Connected Machine Agent.
 
 1. Edit the `localPath` with the local path where the logs generated from the onboarding to Azure Arc-enabled servers will be saved per machine.