diff --git a/shadowsocks-csharp/Local.cs b/shadowsocks-csharp/Local.cs
index 01d79ffd..1aa6ff90 100755
--- a/shadowsocks-csharp/Local.cs
+++ b/shadowsocks-csharp/Local.cs
@@ -54,6 +54,11 @@ namespace shadowsocks_csharp
 
                 // Get the socket that handles the client request.
                 Socket listener = (Socket)ar.AsyncState;
+                if (!listener.Connected)
+                {
+                    return;
+                }
+
                 listener.BeginAccept(
                     new AsyncCallback(AcceptCallback),
                     listener);