From: http://blog.csdn.net/gnolhh168/article/details/41725873
USE [master]
GO
EXEC master.dbo.sp_serveroption @server=N'LinkName', @optname=N'rpc', @optvalue=N'true'
GO
EXEC master.dbo.sp_serveroption @server=N'LinkName', @optname=N'rpc out', @optvalue=N'true'
GO