jmeter压测websocket提示：不能连接到服务

jmeter压测websocket，查看结果书中请求和相应数据中没有东西，取样器结果中：
Response message:

[Execution Flow]

• Opening new connection
• Using response message pattern ""
• Using disconnect pattern ""
• Waiting for the server connection for 5000 MILLISECONDS
• Cannot connect to the remote server
• Waiting for messages for 20000 MILLISECONDS
• WebSocket session wasn't started (...that's odd)
• WebSocket client closed by the client

[Variables]

• Message count: 0

[Problems]

Response headers:

SampleResult fields:
ContentType:
DataEncoding: UTF-8

https://www.cnblogs.com/penghaihang/p/7724830.html

按网上操作的一直提示的和上面的错误一样 这个怎么处理