Oops, got the link wrong. http://msdn.microsoft.com/vbrun/vbfusion/[^] Kevin

If your business logic runs on an other machine than your client you have to use i.e. something like the massage queue server, which provides the notification of your client of server side events. regards, bernd

Dave, I got the problem figured out. The problem was in the machine.config file. The proxy setting on the XP SP1 machines was set to true. I changed it to default and it now works. I also installed the certs on the XP SP1 machine for connecting to test, prod, and dr. And all calls work like a champ. Thanks for your help. Mike Lasseter

Thanks.