PI Coresight 2014: Error searching PI Point

Hi,

I can't search PI Point on a new installation of PI Coresight 2014. I've received the following error:

• An error occurred while searching: The underlying connection was closed: An unexpected error occurred on a send.

I've verified on PI Coresight Administration Page that I'm connecting like piadmin to the pi server (VALVDESPISYS01)

Anyone could help me?

Thank you in advance