Firefox proxy server error

Recording HTTPS Traffic with JMeter's Proxy Server

JMeter dummy certificate accepting SSL connections from the browserIf you are using another browser be sure that you insert the IP/PORT address in the HTTPS Proxy field.

Start your JMeter Proxy Server and the B

To record encrypted traffic, accept JMeter’s dummy certificate.

  • Click “I Understand the Risks”
  • Click “Add Exception...”
  • Uncheck “Permanently store this exception”
  • Click “Confirm Security Exception”

Now, you can see that the encrypted traffic was successfully recorded. You can also find errors in the JMeter log:

ERROR - jmeter.protocol.http.proxy.Proxy: Problem with SSL certificate? Ensure browser is set to accept the JMeter proxy cert: Received fatal alert: bad_certificate Received fatal alert: bad_certificate

Troubleshooting when JMeter’s SSL certificate is only valid for the JMeter ProxyYou can easily ignore these types of errors as they are not related to the traffic for BlazeMeter's app. If you open the network tab in Firebug, you can see that along with Blazemeter’s HTTPS traffic, there are also encrypted traffic from external sites.

How to Remove JMeter 's Dummy Certificate

To remove JMeter's dummy certificate, open Preferences -> Advanced -> Certificates -> View Certificates. In a new window choose “Servers” tab. Select certificate and click “Remove”.

Troubleshooting when JMeter’s SSL certificate is only valid for the JMeter Proxy: Clear historyWhen recording encrypted traffic, there are 2 issues that can pop up.

1. No possibility to add an exception. uses an invalid security certificate. The certificate is not trusted because it is self-signed.

The certificate is only valid for the JMeter Proxy (Error code: sec_error_cert_signature_algorithm_disabled).

2. The browser prevents adding an exception

You will see a warning message: “This site provides valid, verified identification. There is no need to add an exception.”

The solution for both issues is the same. Clear your browser history. A quick Ctrl+Shift+Delete, and clearing the history of the last hour should do it, though, sometimes you may have to clear ALL your history if recording the site for a long time.

BlazeMeter's Chome Extention suporrts both HTTP/HTTPS protocols, record/edit features and you can achieve similar results without any JMeter configurations and without SSL certificate troubleshooting. To use this tool BlazeMeter account is required to convert the recording into a JMeter script (.jmx) file as this process is done on the server side. Any BlazeMeter account will work (free or paid). The JMeter Chrome extension is free to use for as long as you like.

Want to Learn More About JMeter & Load Testing?

If you are new to JMeter, and you’d like to learn more, please sign up for our free online JMeter training course.


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