Looking at it more carefully doesn't reveal anything at JBossWS processing level. That piece of code prepares the SOAPMessageContext upon receiving the HTTPRequest InputStream. My 2 cents: In this case i'd say that the servlet engine probably has written something back to .NET client without notice. Do you have any HTTP logs available at the client side? A look at the jboss-tomcat logs might help as well. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3993000#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...