Who knows the Minecraft error code?

As soon as I try to connect to a server in the LAN, it breaks the load after a while and displays the following error code:

(See attachement)

Would be really great if someone knows a solution. Thanks in advance.

I do not know how to solve it, but it's definitely related to your Lan connection

On what kind of server do you want that? Public /

public:
- Check your Windows Firewall
- Disable trial virus protection (Which one do you have?)

private:
- With you or a friend?
- With you: Firewall control the PC on which the server is running.
- Friend: Port Forwarding / VPN Check.

Private by a friend sitting next to me. Does the firewall need something special?

The port 25565 / TCP should be opened if it is a server, if it is a LAN world the port that is in the chat must be opened.

Or just make the firewall for the time you play out you are not on the Internet or so in the time when nothing happens

Tried to open the port through the firewall. Connection still does not work.

How is the latency time to the server?
Is something in the server log?