Minecraft Putty Console stops responding, how can I restart it?

I accidentally loaded too many plugins and worlds onto the server, then started it and now the last thing it says is "Exception: java.lang.OutOfMemoryError". I tried several times to stop the server with "cd / home / MCServer2 and./start.sh stop". It does not work. I can always access this screen and would like to stop it.

Find out the process ID to the server and kill the process. Or simply: Restart the host and make sure that the server does not start automatically.

Seems to be a vServer you use. Just restart the server in the web interface. Thus, all screens are killed. Otherwise, you can kill a screen like this:

screen -X -S screenname kill

Thank you, I have just all successfully kills and restarted the most important again, thanks, now everything works!