我在本地工作的quasar聊天应用程序中有羽毛js。然后我转移到远程服务器，现在我一直在浏览器控制台中收到此错误：
WebSocket connection to 'ws://mydomain.com:8089/socket.io/?EIO=3&transport=websocket' failed: WebSocket is closed before the connection is established.
我可以ping服务器，netstat告诉我以下内容：
tcp6 0 0 :::8089 :::* LISTEN 0 191916 22828/node
tcp6 0 0 <server-ip-address>:8089 <client/local-ip-address>:57168 CLOSE_WAIT 0 216624 22828/node
tcp6 0 0 <server-ip-address>:8089 <client/local-ip-address>:57740 CLOSE_WAIT 0 216636 22828/node
tcp6 0 1 <server-ip-address>:8089 <client/local-ip-address>:55256 LAST_ACK 0 0 -
tcp6 0 1 <server-ip-address>:8089 <client/local-ip-address>:54280 LAST_ACK 0 0 -
tcp6 0 1 <server-ip-address>:8089 <client/local-ip-address>:56086 LAST_ACK 0 0 -
tcp6 0 0 <server-ip-address>:8089 <client/local-ip-address>:57496 CLOSE_WAIT 0 216629 22828/node
tcp6 0 1 <server-ip-address>:8089 <client/local-ip-address>:55182 LAST_ACK 0 0 -
tcp6 0 1 <server-ip-address>:8089 <client/local-ip-address>:54774 LAST_ACK 0 0 -
tcp6 0 0 <server-ip-address>:8089 <client/local-ip-address>:57414 CLOSE_WAIT 0 216626 22828/node
tcp6 0 1 <server-ip-address>:8089 <client/local-ip-address>:55552 LAST_ACK 0 0 -
tcp6 0 0 <server-ip-address>:8089 <client/local-ip-address>:56808 CLOSE_WAIT 0 216615 22828/node
tcp6 0 0 <server-ip-address>:8089 <client/local-ip-address>:56342 CLOSE_WAIT 0 216606 22828/node
tcp6 0 1 <server-ip-address>:8089 <client/local-ip-address>:55470 LAST_ACK 0 0 -
tcp6 0 0 <server-ip-address>:8089 <client/local-ip-address>:56594 CLOSE_WAIT 0 216613 22828/node
tcp6 0 0 <server-ip-address>:8089 <client/local-ip-address>:56174 CLOSE_WAIT 0 216604 22828/node
tcp6 0 1 <server-ip-address>:8089 <client/local-ip-address>:54848 LAST_ACK 0 0 -
tcp6 0 1 <server-ip-address>:8089 <client/local-ip-address>:55884 LAST_ACK 0 0 -
tcp6 0 1 <server-ip-address>:8089 <client/local-ip-address>:55796 LAST_ACK 0 0 -
tcp6 0 1 <server-ip-address>:8089 <client/local-ip-address>:54366 LAST_ACK 0 0 -
tcp6 0 0 <server-ip-address>:8089 <client/local-ip-address>:58310 ESTABLISHED 0 216782 22828/node
tcp6 0 0 <server-ip-address>:8089 <client/local-ip-address>:56428 CLOSE_WAIT 0 216608 22828/node
tcp6 0 0 <server-ip-address>:8089 <client/local-ip-address>:57980 CLOSE_WAIT 0 216640 22828/node
tcp6 0 1 <server-ip-address>:8089 <client/local-ip-address>:55630 LAST_ACK 0 0 -
tcp6 0 0 <server-ip-address>:8089 <client/local-ip-address>:57902 CLOSE_WAIT 0 216638 22828/node
tcp6 0 0 <server-ip-address>:8089 <client/local-ip-address>:57086 CLOSE_WAIT 0 216619 22828/node
tcp6 0 0 <server-ip-address>:8089 <client/local-ip-address>:57574 CLOSE_WAIT 0 216631 22828/node
tcp6 0 0 <server-ip-address>:8089 <client/local-ip-address>:58066 CLOSE_WAIT 0 216643 22828/node
tcp6 0 1 <server-ip-address>:8089 <client/local-ip-address>:55104 LAST_ACK 0 0 -
所以我认为它已被倾听，但尝试时无法真正连接。
从另一台计算机输出nmap：
nmap -P0 <serverip>
Not shown: 994 closed ports
PORT STATE SERVICE
25/tcp open ssh
135/tcp filtered msrpc
139/tcp filtered netbios-ssn
445/tcp filtered microsoft-ds
8080/tcp open http-proxy
8089/tcp open unknown
使用netcat：
nc -vz <serverip> 8089
Connection to <serverip> 8089 port [tcp/*] succeeded!
我没有使用websockets的经验。我选择Primus用ws作为websockets。
有什么问题，因为我无法正常连接？