DirectServerReturnを行うためには、それ前提でEndPointを作る必要あり。
# PowerShell上の実行結果では、EnableDirectServerReturn
===例
PS C:\> get-azurevm -ServiceName cs-web -name web4 | Set-AzureEndpoint -name WebEP -DirectServerReturn $true | Update-AzureVM
Update-AzureVM : BadRequest: Windows Azure does not support modifying Direct Server Return settings on an existing endpoint. Please d
elete and recreate the endpoint with Direct Server Return set to True.
=
負荷分散、まとめ
http://taleofazure.blogspot.jp/2015/03/blog-post_4.html