we have provided a web service for another system to send attachents (pdf docs) to us. This is working fine when tested using soap ui. It has stopped working when the other guys send from their system using their application.
we have captured the data using fiddler from both soap ui and the application - there is no discernable difference.

the problem is that our web server is not giving any helpful error messages so we can't work out what the problem is.

Is there any tool we could use to take the data that was posted (and captured using fiddler) and have it tell us what is wrong?