Private Process Tutorial - MS Biztalk RN Accelerator

Hi everyone,
I'm just a week old to the RosettaNet world. I am working on the
tutorials given in the BizTalk RN Accelerator help.
To be specific, I am on the Private Process tutorial. I have setup two
systems, configured the certificate and everything else as mentioned
in the tutorial. But still, when I try to "Submit" message from the
LOB WebApplication from System2 by using the URL http://<system2
machine name>/lobwebapplication/default.aspx, I see only 1 outgoing
message and no incoming message.

The execution of SQL query [SELECT * From MessagesFromLOB] on System2
always shows that there is one more new row added with MsgCategory of
'10'. The execution of SQL query [SELECT * From MessagesToLOB] on
System2 has no new records.

Any pointers as to any common made mistakes, pls help me out.

Thanks