您好我已经在nodejs中创建了一个聊天应用程序，它在我的机器上工作正常但是当我在我的vps上尝试时它总是在尝试连接到数据库时停止运行这是我得到的错误日志
root@server:/etc/init.d# node /NodeJS/ChatServer/server.js
Server has started trying to connect to Database
Connection to Database has been made
events.js:85
throw er; // Unhandled 'error' event
^
Error: Connection lost: The server closed the connection.
at Protocol.end (/NodeJS/ChatServer/node_modules/any-db-mysql/node_modules/mysql/lib/protocol/Protocol.js:103:13)
at Socket.<anonymous> (/NodeJS/ChatServer/node_modules/any-db-mysql/node_modules/mysql/lib/Connection.js:102:28)
at Socket.emit (events.js:129:20)
at _stream_readable.js:908:16
at process._tickCallback (node.js:355:11)