Spent a few hours chasing this one down and thought I’d pass along the info…
I developed a flow service to process a plain text email body received through an email polling port. As expected and consistent with many postings here, the email body is retrieved through an InputStream object in the pipeline named ffdata.
Testing went fine. Deployed to another Integration Server. No problem. Deployed to a thrid Integration Server… the flow service stopped working.
It turned out that on the third Integration Server, my flow service was getting launched with an input pipeline variable named contentStream instead of ffdata. contentStream is what you get in your pipeline if the received content type from the email port is not recognized.
The issue turned out to be that I was getting contentStream instead of ffdata on Integration Servers where Trading Networks was not installed.
I was surprised that installation of Trading Networks affects the behavior of Integration Server functions when no document is submitted to TN. Does this make sense to others, and can anyone think of other examples where TN installation affects Integration Server behavior (apart from TN) functions?