[Serguei Kouzmine]

во первых

Код:

Proxy

NAME
    New-WebServiceProxy

SYNTAX
    New-WebServiceProxy [-Uri] <uri> [[-Class] <string>] [[-Namespace]
    <string>]  [<CommonParameters>]

    New-WebServiceProxy [-Uri] <uri> [[-Class] <string>] [[-Namespace]
    <string>] [-Credential <pscredential>]  [<CommonParameters>]

    New-WebServiceProxy [-Uri] <uri> [[-Class] <string>] [[-Namespace]
    <string>] [-UseDefaultCredential]  [<CommonParameters>]

и потом у WebProxy Class
https://msdn.microsoft.com/en-us/lib...v=vs.110).aspx
https://msdn.microsoft.com/en-us/lib...v=vs.110).aspx
есть property

Код:

	Address	
Gets or sets the address of the proxy server.