You wrote that as I was editing my last post, which essentially resolved things, but just to be clear, I AM using Port 1433 on the server, and there is no specific rule on either A or B that addresses that port. It isn't explicitly opened or closed on either system. There are enough rules to make a lawyer giddy, and I have no desire to go through each and every one of them, but most have the ports set to Any, so they SHOULD also deal with port 1433.