Good morning colleagues.

I have jmeter test scenario I must run on my back-end service. If I use 1 or ~50 Threads(users) in one time there is no problem. But when I try to set more than 50 users I got an errors like this :

java.net.SocketException: Connection reset

How can I fix it ?

jMeter version 4.0

java 10.0.1

OS Windows 10 64

Full Log :

java.net.SocketException: Connection reset at java.base/java.net.SocketInputStream.read(Unknown Source) at java.base/java.net.SocketInputStream.read(Unknown Source) at java.base/sun.security.ssl.SSLSocketInputRecord.read(Unknown Source) at java.base/sun.security.ssl.SSLSocketInputRecord.bytesInCompletePacket(Unknown Source) at java.base/sun.security.ssl.SSLSocketImpl.bytesInCompletePacket(Unknown Source) at java.base/sun.security.ssl.AppInputStream.read(Unknown Source) at org.apache.http.impl.io.AbstractSessionInputBuffer.fillBuffer(AbstractSessionInputBuffer.java:161) at org.apache.http.impl.io.SocketInputBuffer.fillBuffer(SocketInputBuffer.java:82) at org.apache.http.impl.io.AbstractSessionInputBuffer.readLine(AbstractSessionInputBuffer.java:278) at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:138) at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:56) at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259) at org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:286) at org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:257) at org.apache.jmeter.protocol.http.sampler.hc.ManagedClientConnectionImpl.receiveResponseHeader(ManagedClientConnectionImpl.java:199) at org.apache.jmeter.protocol.http.sampler.MeasuringConnectionManager$MeasuredConnection.receiveResponseHeader(MeasuringConnectionManager.java:212) at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273) at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125) at org.apache.http.impl.client.DefaultRequestDirector.tryExecute(DefaultRequestDirector.java:684) at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:486) at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:835) at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83) at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.executeRequest(HTTPHC4Impl.java:697) at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:455) at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:74) at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1189) at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1178) at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:490) at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:416) at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:250) at com.blazemeter.jmeter.controller.JMeterThreadParallel.run(JMeterThreadParallel.java:61) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.base/java.util.concurrent.FutureTask.run(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.base/java.lang.Thread.run(Unknown Source)


  • 1
    What JMeter, java and OS version do you use? Could you attach jmeter full log? Feb 14, 2019 at 9:55
  • @VadimYangunaev updated question Feb 14, 2019 at 10:37
  • and the same issue with JMeter 5.0? Feb 14, 2019 at 11:35
  • @VadimYangunaev You think jMeter 5 will be better than 4 ? ok I'll try. Feb 14, 2019 at 11:54
  • @VadimYangunaev the problem is still here. first I got 500 Code from Back-end and than Connection reset message. may be Back-end cannot open new Connections ? Feb 14, 2019 at 12:27

3 Answers 3


Looks like this is an issue with application under test and it does not configured properly to handle this load.

  1. Application server logs.
  2. Open your application in the browser, while it under the load testing - does it work properly?
  • 1. - did you mean Access Log Sampler ? 2 - which browser you are talking about ? Feb 14, 2019 at 11:09
  • 3
    No, I mean it does not looks like JMeter issue, but the application. Because if for 50 threads it works ok. 1. So, any kind of logs from your service. Do you have access to them? And what kind of back end service is it? 2. And any case to get responsce from your service outside of JMeter. Feb 14, 2019 at 11:17
  • I test REST service and Requests, which failed with "Connection reset" message are never write to log. Feb 14, 2019 at 11:22
  • 1
    What is your application server where you host REST service? Feb 14, 2019 at 12:42

Please implement the below steps, your "Connection reset" problem will be resolved.

  • Change "Implementation" of all your HTTP Request samplers to HttpClient4. The easiest way of doing it is using HTTP Request Defaults configuration element.

  • Please add the following properties in user.properties file which located under /bin folder of your JMeter installation:


  • Add the next line to hc.parameters file (same location, JMeter's /bin folder)


  • Please restart your JMeter
  • unfortunately, it doesn't help. I still got Connection reset messages after restarting jMeter. Feb 14, 2019 at 11:28

I had message "address already used" in JMeter 5.1 (Windows 10) when I tested Java Spring app. It helped me a lot: enter link description here

(No need reload Windows and stop JMeter and application - You can play with parameters on fly.)

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