传回成员的认证伺服器url。
当伺服器模拟客户端时，透过伺服器使用客户端的认证执行任何的操作。
When the server is impersonates the client, any operations performed by the server use the client's credentials.
只有在用户端建立与伺服器的关系时，DCOM才会验证用户端的认证。
DCOM authenticates the credentials of the client only when the client establishes a relationship with the server.
所以当目的伺服器不需要用户端验证时，最好不要传送认证。
When the destination server does not require client authentication it is best to not send credentials.
所以当目的伺服器不需要用户端验证时，最好不要传送认证。
When the destination server does not require client authentication it is best to not send credentials.
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