Silverlight接收远程服务器返回错误Not Found，服务继续运行并完美结束

I have a silverlight application, when I call a WCF service that takes longer than two minutes, I get the error "remote server returned an error Not Found", execution continues on the server, it ends perfectly. I know that, because of the results in the database tables and because I get an email at the end of the run.I have a silverlight application, when I call a