Hello, Please prefer sending error messages as text (e.g. copy-paste from terminal), as it makes the errors searchable. For instance, https://lists.apache.org/list.html?dev@jmeter.apache.org is not able to search for text in images.
What you see are flaky tests. There are tests that use real-life servers in order to verify JMeter's ability to work with modern systems. In other words, some of the tests attempt to access apache.org to verify if HTTP sampler is still able to talk to the modern HTTPS, and so on. It turns out, the responses are not 100% reliable, and sometimes DNS fails to resolve the host, sometimes the server responds with a slightly different error and so on. I have seen the errors you mention, and the errors are transient. They appear and disappear at random. If you like, you can analyze the nature of the failure and try to make the tests more reliable, however, the key nature of the tests is they use true systems that have inherent failures. In other words, we could rework the tests to use Docker-based HTTP servers, however, that would kill the idea. Then we would keep testing JMeter with a canned version of some HTTP server, and we would never know the sampler no longer works with the modern web. Vladimir
