请先检查防火墙设置.

通常试图获取异步Web服务操作结果的异常表示无法满足请求–如果该服务在某些计算机上可用，则几乎可以肯定是连接问题.尝试在浏览器中导航到.svc.如果即使看到服务也有问题，请检查您的连接和防火墙设置.否则，请检查是否允许Silverlight应用程序访问Internet.

Exceptions trying to get the result of an asynchronous web service operation usually mean that there was a problem fulfilling the request – and if the service works on some machines, that is almost certainly a connection issue. Try navigating to the .svc in a browser; if there is a problem even seeing the service then check your connection and firewall settings. Otherwise, check that Silverlight apps are permitted to access the Internet.