服务器websocket连接失败

如题，生产环境websocket连接失败，前端报错：WebSocket connection to 'wss://im.tnshow.com:5260/' failed:

因为原来是可以用的，排除代码和防火墙安全组的问题。百度一下解决问题方式

location /wss/ {

            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";

   }

仍然没有解决我的问题，查找后台日志：

2021-05-31 17:35:40,989 ERROR o.t.core.ReadCompletionHandler[284]: server:NULL, client:113.89.3.89:6823, javax.net.ssl.SSLException: Received fatal alert: certificate_unknownjava.nio.HeapByteBuffer[pos=7 lim=7 cap=7]
javax.net.ssl.SSLException: Received fatal alert: certificate_unknown

javax.net.ssl.SSLException: Received fatal alert: 

是因为SSL证书更新，没有同步到这个项目所致。