Getting error when setting up subscription

Messages

Unable to set the Publisher login for the updatable subscription. You may have to set this up directly on the Subscriber machine using sp_link_publication. (New Subscription Wizard)------------------------------ADDITIONAL INFORMATION:An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)------------------------------The security mode specified requires the server 'CISSW-YUKON03' in sysservers. Use sp_addlinkedserver to add the server.Changed database context to 'ReportServer'. (Microsoft SQL Server, Error: 20620)For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=09.00.2047&EvtSrc=MSSQLServer&EvtID=20620&LinkId=20476

any ideas?

thanks