JMeter TCP Sampler incorrectly reports 500

Question

I\'m using JMeter to load test our SMTP server using the TCP Sampler (BinaryTCPClientImpl class) to fire HELOs, wait for 30 seconds and then QUITing.

The SMTP server

Answer 1

If you don't define the EOM byte, it reads until the end of the stream. Since the stream isn't going to end, it times out. You have to set the EOM byte correctly for the protocol you're using.