RPC and RPC Out option on a SQL Server linked-server
The first RPC setting is mainly for a legacy feature called Remote Server, which is documented here. http://msdn.microsoft.com/en-us/library/ms190187.aspx You probably will not be using remote servers in SQL Server 2005 -SQL Server 2014 versions. If you do happen to use “remote servers”, the RPC setting enables a certain security feature. Sources: