本文介绍了一种常见的Unity开发中出现的SecurityException错误：无法连接，因为未找到有效的跨域策略。通过调整构建设置中的平台选项，可以有效解决此问题。
SecurityException: Unable to connect, as no valid crossdomain policy was found
System.Net.Sockets.Socket.Connect_internal (IntPtr sock, System.Net.SocketAddress sa, System.Int32& error, Boolean requireSocketPolicyFile)
System.Net.Sockets.Socket.Connect (System.Net.EndPoint remoteEP, Boolean requireSocketPolicy)
System.Net.Sockets.Socket.Connect (System.Net.EndPoint remoteEP)
System.Net.Sockets.UdpClient.DoConnect (System.Net.IPEndPoint endPoint)
System.Net.Sockets.UdpClient.Connect (System.Net.IPEndPoint endPoint)
System.Net.Sockets.Socket.Connect_internal (IntPtr sock, System.Net.SocketAddress sa, System.Int32& error, Boolean requireSocketPolicyFile)
System.Net.Sockets.Socket.Connect (System.Net.EndPoint remoteEP, Boolean requireSocketPolicy)
System.Net.Sockets.Socket.Connect (System.Net.EndPoint remoteEP)
System.Net.Sockets.UdpClient.DoConnect (System.Net.IPEndPoint endPoint)
System.Net.Sockets.UdpClient.Connect (System.Net.IPEndPoint endPoint)
System.Net.Sockets.UdpClient.Connect (System.String hostname, Int32 port)
之前team 里人也遇到过这个问题，后来通过复制别人的工程解决了， 这次是大家全军覆没，所以我就想办法了，
一顿谷歌之后发现web player会报这个错，一看顿时晕了，我工程啥时候变成web player了
菜单 File -> Buliding Settings -> PC and Mac Standalone,
然后点下面按钮 Switch Platform 切换平台
问题解决
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