Connection timed out error in JMeter test execution

Question

When am running my JMeter scripts using GUI for few of the samples sometimes am getting Connection timed out error and response are not getting, but if I run the same test after few mins I got the response for the same samples.

Can anybody please answer what is the solution for this?

Currently am checking the response time of each page, if add timers than the page response time will be showing more right?

Answer 1

There are at least 3 possibles reasons:

• Your server (meaning web servers handling request and any components after them) is not handling the load correctly and slowing down, monitor the system and check

• You have exhausted your injector ephemeral ports , you need to adjust your OS TCP settings to increase port range

• You're running load test in GUI mode with a View Results Tree in test, this is bad practice as GC will happen frequently possibly triggering Stop The World leading to this. As per best-practices use NON GUI mode:

  • https://jmeter.apache.org/usermanual/best-practices.html
  • https://www.ubik-ingenierie.com/blog/jmeter_performance_tuning_tips/