You can execute XP Server procedures using a CIS RPC mechanism, in addition to routing through the site handler.
Set the options needed to use this mechanism, cis rpc handling and negotiated logins, by entering:
//to set 'cis rpc handling'//
sp_configure 'cis rpc handling', 1 //or at the session level// set 'cis rpc handling' on
//to set 'negotiated logins'// sp_serveroption XPServername, 'negotiated logins', true
If either option is not set, the ESP is routed through the site handler, and no warning message appears.