ClientDisconnected due to error: Timeout?

Hi this is my first post here,

I was trying to use NetworkDiscovery to broadcast messages over LAN, my client can receive some broadcast messages in a short time but soon encountered this error and disconnects

What I did:
On one game process, I start NetworkLobbyManager as a host, initialize NetworkDiscovery, and start NetworkDiscoveryas a server,
On my editor, I run the game in editor , start NetworkLobbyManageras a client, initialize NetworkDiscovery, and start it as a client.

I have searched around but nobody post a solution to this, anyone can help?

Edit:
Unity 5.5.2f1
Edit 2:
I used default network address (localhost) and port (7777) for connection

 

Turns out I get this error because the client connecting to it itself