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WhyserWhyser 

Outbound Message Error: SOAP Response was a nack

I have a listener that use to process lead information via outbound messaging.
 
Ever since the Summer 08 release, I've been having issues with my listener, and I'm getting a lot of messages that are failing to deliver with the "SOAP response was a nack".
 
I haven't changed the code nor has the database structure changed for the leads.
 
In some of the other forums, I've noticed that people say to rebuild your project with an updated Endpoint WSDL and/or the Enterprise WSDL. I have done both, and it hasn't changed anything.
 
I'm kind of a newbie programmer, I'm not sure how to go about debugging this problem, can anyone point me in the right direction?
WhyserWhyser
Okay, I figured it out.
 
Turns out that there is a checkbox called "Send Session ID".
 
I'm not sure if this is a new checkbox or not, but after checking it, all the messages in the queue started going through. Looks like I was making a request, and I wasn't able to update Salesforce again because I didn't send the session ID.
 
Anyways I'm pretty sure this was working before the Summer 08 release.