Biztalk 2006 - BAS Site Issue

Hi,
I am stuck with this problem while working on the biztalk 2006 tutorial 2 lesson 3 test scenario. I followed the instructions religiously in the documentation and while testing the scenario of trading partners management i am unable to post the purchase order document on to the inbox folder of partner.
The steps i follwed are like this.
I have built the httppost.sln given in the tutorial and tried running the submitbatch.bat file. Initially it gave me an error INternal server error number 415 and then i fixed going to iis and changing the credentilas of the application pool TutorialHttpReceiveApppool.
When i executed the Submitorder.Bat file this time it gave me 500 error. I am not sure what to do at this point of time.
Any suggestions will be appreciated.
Note: My environment is, i have set up win2003 OS with sp1 on a VMware machine. i logged in as administrator.

Regards
Nagendra

Sorry I have not looked at that lab or BAS for that matter.

About the only think I can think of would be a problem with the user account not have access to the page (make sure the app domain is a member of BizTalk Users and Administrator is also in the BizTalk Admin group).

Can you call this with a .net component?

Did you try using a file drop instead?

have you removed /root from the managed paths in the Default website for Sharepoint?
Thanks,
Hanu