sorry for the delay.. I had to do some other tasks before coming back to this...
As I followed the scripts attached to the article, there is a [SampleServiceSource] on the source server and a [SampleServiceTarget] on the target server.
Anyway, I'm questioning myself on the query you provided in the article one need to use to test message transmission... Should I update the TO SERVICE clause like this:
DECLARE @convHandle UNIQUEIDENTIFIER
BEGIN DIALOG @convHandle
FROM SERVICE [SampleServiceSource]
TO SERVICE '\\TargetServer\SampleServiceTarget'
ON CONTRACT [SampleContract]
--sql code to create and send a message to remote service
DECLARE @XMLMessage as XML;
SET @XMLMessage = (SELECT TOP 1 * FROM [Order] FOR
XML PATH('SampleMessage'), ELEMENTS XSINIL, TYPE
SEND ON CONVERSATION @convHandle MESSAGE TYPE [SampleMessage] (@XMLMessage) ;