JMeter代理服务器拒绝连接问题求助：Web应用负载测试配置异常

Hey Ramakrishnan! As someone who’s helped tons of new JMeter users work through proxy kinks, let’s walk through the most common fixes to get your load testing up and running. Since you’ve followed the official guide, we just need to double-check a few critical details that often trip folks up.

First: Verify Firefox Proxy Configuration #

Let’s start with the browser side—even a tiny mismatch here can break everything:

• Open Firefox’s Settings → scroll down to Network Settings → click "Settings..."
• Confirm you’ve selected Manual proxy configuration
• Fill in these details exactly:
  • HTTP Proxy: localhost (or 127.0.0.1—both work, but stick to one to avoid confusion)
  • Port: 8080 (must match what you set in JMeter)
  • Check the box for Use this proxy server for all protocols—this ensures HTTPS requests are routed through JMeter too
  • In the "No Proxy for" field, make sure localhost, 127.0.0.1 are listed—this prevents JMeter from trying to proxy its own internal requests

Next: Double-Check JMeter’s HTTP(S) Test Script Recorder #

Now let’s confirm JMeter’s side is configured correctly:

• Open the HTTP(S) Test Script Recorder (under WorkBench or your Test Plan)
• Verify the Port field is set to 8080 (same as Firefox)
• Ensure you’ve selected a valid Target Controller (e.g., the Thread Group in your test plan—if you leave this blank, requests won’t be saved)
• For HTTPS recording (critical if your app uses HTTPS):
  1. Click the "Generate Root CA Certificate" button in the recorder
  2. Save the certificate file (usually named ApacheJMeterTemporaryRootCA.crt)
  3. Go back to Firefox’s Settings → Privacy & Security → scroll to Certificates → click "View Certificates" → "Import"
  4. Select the saved certificate, check "Trust this CA to identify websites", and finish the import
• Take a quick look at the Request Filtering tab—make sure you haven’t accidentally added a filter that blocks your app’s domain. If you’re unsure, temporarily clear all include/exclude patterns to test.

Quick Troubleshooting Checks #

If it’s still not working, run through these quick tests:

• Make sure JMeter’s proxy is actually running: Click "Start" in the recorder, and check the JMeter console for a line that says ProxyServer: started
• Disable any Firefox extensions that handle proxies (VPNs, ad blockers, privacy tools)—these often override your manual proxy settings
• Test if port 8080 is blocked: Try switching to a different port (e.g., 8888) in both JMeter and Firefox, then restart the proxy
• Open your web app in Firefox and watch JMeter’s View Results Tree—if no requests show up, your traffic isn’t reaching the proxy, so double-check browser/proxy IP/port matches

If you’re still stuck, share specific details like:

• A screenshot of your Firefox proxy settings
• Any error messages from the JMeter console
• Whether you’re testing an HTTP or HTTPS app

That’ll help narrow down the issue even faster!

内容的提问来源于stack exchange，提问作者Ramakrishnan Ramar