How can I determine the configuration of TLS/SSL in Firefox ver 38?

I received the following message (partially shown) when I tried to connect to a particular Web site.

The secure connection failed
An error occurred during a connection to xxxxxx.xxx. Cannot communicate securely with counterpart: no common encryption algorithm. (Error code: ssl_error_no_cypher_overlap).
The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.

I tried the MS IE browser and had a similar view. I checked the security settings on IE, added TLS 1.1 and 1.2 of TLS selections and solved my problem on the Internet Explorer browser.

So I wanted to check the settings for TLS/SSL on Firefox but couldn't find where they were selected. I thought that they used to be under Tools/Options. Where can I go to check them?

You can post a link to a page accessible to the public (i.e. no authentication or signature required)?

The site may attempt to return to a lower version of TLS in a way that is no longer allowed in current versions or maybe use a deprecated suite of encryption.

You can open the topic: config page through the address bar and use the search bar to locate this pref:

  • Security.TLS.insecure_fallback_hosts

You can double-click the line to edit the prefs and add the complete field to the value of this preference.
If there are already websites (domains) in this list, then add a comma and the new domain (without space).
There should be only areas separated by a comma in the column value (example.com,www.example.com).

If this help you can contact this Web site and ask them to look into this and update their security.

Tags: Firefox

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