For the AppServer or a socket object, this is the digital certificate subject name of the server for the current SSL session. It enables you to distinguish between the physical host name and the authenticated SSL server name.
For Web services, this is the digital certificate subject name of the -SOAPEndpoint (which is the URL identifying the endpoint for the Web service, not the server providing the WSDL).
When there is no socket connection, or the socket connection is not an SSL-based connection, the default value is the Unknown value (?).
