使用JMeter录制脚本时遭遇连接中断与致命警报错误求助

Hey AvaN, sorry to hear you're stuck with connection abort and fatal alert errors while recording scripts in JMeter—let’s walk through the most common fixes to get you back on track:

1. SSL/TLS Version Mismatch (Top Cause for Fatal Alerts) #

Fatal alerts usually pop up when JMeter’s default SSL settings don’t align with your target website’s supported TLS versions (e.g., the site uses TLS 1.3 but JMeter isn’t configured to use it).

• Fix steps:
  1. Navigate to your JMeter installation’s bin folder and open the system.properties file.
  2. Add or update these lines to enable modern TLS protocols:

     https.socket.protocols=TLSv1.2,TLSv1.3
     javax.net.ssl.trustStore=../bin/client.jks
     javax.net.ssl.trustStorePassword=changeit
     

  3. Save the file and restart JMeter. Also ensure your browser’s proxy settings allow these TLS versions.

2. Misconfigured Proxy (Triggers Connection Aborts) #

If your browser and JMeter’s recorder proxy aren’t synced, or the proxy port is blocked, you’ll get connection drops.

• Fix steps:
  • Verify the JMeter recorder’s port (default 8888) isn’t occupied:
    • On Windows: Run netstat -ano | findstr :8888 in Command Prompt to check for conflicting processes.
    • On Mac/Linux: Use lsof -i :8888 in Terminal.
  • Double-check your browser’s proxy settings: Set the HTTP/HTTPS proxy to localhost and the same port as JMeter’s recorder, then enable "Use the same proxy server for all protocols".
  • Disable your local firewall temporarily, or add an exception rule to allow JMeter’s network traffic.

3. Missing/Incorrect JMeter Root Certificate #

For HTTPS recording, JMeter needs a trusted root certificate to decrypt traffic. Skipping this step leads to SSL failures.

• Fix steps:
  1. Start JMeter’s HTTP(S) Test Script Recorder, then save the generated ApacheJMeterTemporaryRootCA.crt file to your JMeter bin folder.
  2. Import this certificate into your browser’s Trusted Root Certification Authorities store:
     • For Chrome: Go to Settings > Privacy and Security > Security > Manage Certificates > Trusted Root Certification Authorities > Import.
     • For Firefox: Go to Settings > Privacy & Security > Certificates > View Certificates > Authorities > Import.
  3. Restart your browser and try recording again.

4. Target Website’s Anti-Scraping Measures #

Some sites detect non-browser-like requests (e.g., generic User-Agent, rapid requests) and abort connections.

• Fix steps:
  • Add a realistic User-Agent header in the JMeter recorder’s "Request Headers" tab—copy the exact User-Agent string from your browser’s DevTools (Network tab).
  • Slow down your recording pace to mimic human behavior: Use the recorder’s "Delay between samples" setting to add 1-2 second gaps between actions.
  • If the site uses captchas or session tokens, complete any manual verification steps in your browser before starting the recorder.

内容的提问来源于stack exchange，提问作者AvaN