Yesterday, I was just trying to attach a DIME attachment to my soap message and send it to a WSE 2.0 enabled web service resides on my virtual server (VMWare). I was getting “Message Expired” or “An error was discovered processing the header” all the time. It was obvious that this was happening on the client since soap request was not reaching to the server (I was monitoring the server by MSSOAPTrace and nothing was there). After I did a lot of changes to the client I came to realize that Date and Time on the server was out of synch with client. That was all about it.