UseSsl=true throws exception with IOmultiplexing

An unhandled exception of type 'System.NotSupportedException' occurred in System.dll

Additional information: The BeginRead method cannot be called when another read operation is pending.

System.dll!System.Net.Security._SslStream.WriteCallback(System.IAsyncResult transportResult) + 0xd6 bytes
System.dll!System.Net.LazyAsyncResult.Complete(System.IntPtr userToken) + 0x65 bytes
System.dll!System.Net.ContextAwareResult.CompleteCallback(object state) + 0x7 bytes
mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) + 0xa7 bytes
mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) + 0x16 bytes
mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) + 0x41 bytes
System.dll!System.Net.ContextAwareResult.Complete(System.IntPtr userToken) + 0x83 bytes
System.dll!System.Net.LazyAsyncResult.ProtectedInvokeCallback(object result, System.IntPtr userToken) + 0xa6 bytes
System.dll!System.Net.Sockets.BaseOverlappedAsyncResult.CompletionPortCallback(uint errorCode, uint numBytes, System.Threading.NativeOverlapped* nativeOverlapped) + 0x98 bytes
mscorlib.dll!System.Threading._IOCompletionCallback.PerformIOCompletionCallback(uint errorCode, uint numBytes, System.Threading.NativeOverlapped* pOVERLAP) + 0x6e bytes