How to avoid the Synthetic Browser monitor Error Code 12049 "ERR_SSL_CLIENT_AUTH_CERT_NEEDED"

Mareeswaran — Fri, 10 Jan 2025 14:00:00 GMT

Self Service Summary

Some websites initially respond with an error that they need a client certificate, however, a second request to the page is successful. In these cases, Native Chrome intially sees the error "ERR_SSL_CLIENT_AUTH_CERT_NEEDED" but retries and is then able to successfully reach the site.

Dynatrace Synthetic Browser Monitors stop the execution as soon as the initial error "ERR_SSL_CLIENT_AUTH_CERT_NEEDED" is received.

Issue	Solution	Tasks	Alternative(s)
Browser Monitor fails with ERR_SSL_CLIENT_AUTH_CERT_NEEDED	Add script to retry	Add script to retry	Add client certificate

Steps to avoid Error Code 12049 "ERR_SSL_CLIENT_AUTH_CERT_NEEDED"

Open the Browser Monitor for editing, using Classic Synthetic
Click on Recorded Clickpath
Add a JavaScript event, using Add synthetic event and move this step as first event
Add the sample JavaScript code below and replace the url which is reporting "ERR_SSL_CLIENT_AUTH_CERT_NEEDED"
var url ="https://when.navigate.to/this/page/there/is/a/ssl/client/error"; //Replace the url which reports ERR_SSL_CLIENT_AUTH_CERT_NEEDED error fetch(url, { "referrerPolicy": "strict-origin-when-cross-origin", "method": "GET", "mode": "cors", "credentials": "omit" });
The next event in the clickpath, should be a Navigate Event to the same url

What's next?

It may be that you need to provide the client-side certificate. In this case, you can add it to the Dynatrace Synthetic Browser Monitor here

Otherwise, please open a chat or support ticket and provide a link to the Dynatrace Synthetic Browser Monitor, along with the troubleshooting steps you have already tried.

Re: How to avoid the Synthetic Browser monitor Error Code 12049 "ERR_SSL_CLIENT_AUTH_CERT_NEEDED"

AntonPineiro — Fri, 10 Jan 2025 15:23:19 GMT

Thank you!

article How to avoid the Synthetic Browser monitor Error Code 12049 "ERR_SSL_CLIENT_AUTH_CERT_NEEDED" in Troubleshooting

How to avoid the Synthetic Browser monitor Error Code 12049 "ERR_SSL_CLIENT_AUTH_CERT_NEEDED"

Self Service Summary

Steps to avoid Error Code 12049 "ERR_SSL_CLIENT_AUTH_CERT_NEEDED"

What's next?

Re: How to avoid the Synthetic Browser monitor Error Code 12049 "ERR_SSL_CLIENT_AUTH_CERT_NEEDED"