Throw an error when switching networks. But why hasn't ping been working

[jiangjiali]

Error: System.Net.Sockets.SocketException (0x80004005): Network is unreachable
at System.Net.Sockets.Socket.Send (System.Byte[] buffer, System.Int32 offset, System.Int32 size, System.Net.Sockets.SocketFlags socketFlags) [0x00000] in <00000000000000000000000000000000>:0
at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) [0x00000] in <00000000000000000000000000000000>:0
at Fantasy.KCPClientNetwork.Output (System.Byte[] bytes, System.Int32 count) [0x00000] in <00000000000000000000000000000000>:0
at kcp2k.Kcp.FlushBuffer (System.Int32 size) [0x00000] in <00000000000000000000000000000000>:0
at kcp2k.Kcp.Flush () [0x00000] in <00000000000000000000000000000000>:0
at kcp2k.Kcp.Update (System.UInt32 currentTimeMilliSeconds) [0x00000] in <00000000000000000000000000000000>:0
at Fantasy.KCPClientNetwork.KcpUpdate () [0x00000] in <00000000000000000000000000000000>:0
at Fantasy.KCPClientNetwork.Update () [0x00000] in <00000000000000000000000000000000>:0
at Fantasy.NetworkThread.Update () [0x00000] in <00000000000000000000000000000000>:0

System.Threading.ExecutionContext:RunInternal(ExecutionContext, ContextCallback, Object, Boolean)
Fantasy.UnityLog:Error(String)
Fantasy.Log:Error(Exception)
Fantasy.KCPClientNetwork:Output(Byte[], Int32)
kcp2k.Kcp:FlushBuffer(Int32)
kcp2k.Kcp:Flush()
kcp2k.Kcp:Update(UInt32)
Fantasy.KCPClientNetwork:KcpUpdate()
Fantasy.KCPClientNetwork:Update()
Fantasy.NetworkThread:Update()