Handle Cannot connect to the remote server error

[ngannt-vn]

I faced this issue when trying to connect Websocket through Jmeter plugin, I fixed this by updating java from version 1.8 to version 17. Hope it help for someone

Thread Name:Thread Group 1-1
Sample Start:2025-04-02 18:56:03 ICT
Load time:5066
Connect Time:0
Latency:0
Size in bytes:0
Sent bytes:0
Headers size in bytes:0
Body size in bytes:0
Sample Count:1
Error Count:1
Data type ("text"|"bin"|""):
Response code:
Response message: - Using response message pattern ""

• Using disconnect pattern ""

[Execution Flow]

• Opening new connection
• Waiting for the server connection for 5000 MILLISECONDS
• Cannot connect to the remote server

[Variables]

• Message count: 0

[Problems]

• Unexpected error: null
  JMeter.plugins.functional.samplers.websocket.ServiceSocket.sendMessage(servicesocket.java:188)
  JMeter.plugins.functional.samplers.websocket.WebSocketSampler.sample(websocketsampler.java:160)
  org.apache.jmeter.threads.JMeterThread.doSampling(jmeterthread.java:638)
  org.apache.jmeter.threads.JMeterThread.executeSamplePackage(jmeterthread.java:558)
  org.apache.jmeter.threads.JMeterThread.processSampler(jmeterthread.java:489)
  org.apache.jmeter.threads.JMeterThread.run(jmeterthread.java:256)
  java.lang.Thread.run(thread.java:748)

SampleResult fields:
ContentType:
DataEncoding: UTF-8