This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Wo archive tread sia. Meɖekuku bia biabia yeye ne ehia kpeɖeŋu.

How to re-disable TLSv1.0?

Matthew.Davis.2
Matthew.Davis.2
more options

I tried to visit a website on a private network.

Firefox threw up a security warning about how the web page uses TLSv1.0.

I clicked on the "Enable TLS v1.0" button because I wanted to temporarily view the web page, so that I can look at the TLS certificate to debug an unrelated issue about the cert chain on this site.

Now I want to go back to the default settings, where Firefox blocks TLSv1.0.

How do I do that?

In about:config I looked at security.tls.version.min but it's still on the original value of 3. Yet Firefox is still letting me view that particular page over TLSv1.0 without the security warning.

I tried to visit a website on a private network. Firefox threw up a security warning about how the web page uses TLSv1.0. I clicked on the "Enable TLS v1.0" button because I wanted to temporarily view the web page, so that I can look at the TLS certificate to debug an unrelated issue about the cert chain on this site. Now I want to go back to the default settings, where Firefox blocks TLSv1.0. How do I do that? In about:config I looked at security.tls.version.min but it's still on the original value of 3. Yet Firefox is still letting me view that particular page over TLSv1.0 without the security warning.

Ŋuɖoɖo si wotia

Hi Matthew, I'm not sure what preferences are changed when you enable TLS 1.0, but could you take a look here:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.

(2) In the search box in the page, type or paste TLS and pause while the list is filtered

(3) At the right end of each row that is bolded, indicating that it has been modified, click the arching left-pointing arrow reset button to restore the default value for the preference -- in particular, look for security.tls.version.enable-deprecated

More info on about:config: Configuration Editor for Firefox.

Does that fix it -- meaning, you get the old error message again?

Xle ŋuɖoɖo sia le goya me 👍 0

All Replies (3)

Matthew.Davis.2
Matthew.Davis.2 Biabia la
more options

Here is a printscreen of the original error screen, which is no longer appearing.

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 10 Contributor
more options

Ɖɔɖɔɖo si wotia

Hi Matthew, I'm not sure what preferences are changed when you enable TLS 1.0, but could you take a look here:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.

(2) In the search box in the page, type or paste TLS and pause while the list is filtered

(3) At the right end of each row that is bolded, indicating that it has been modified, click the arching left-pointing arrow reset button to restore the default value for the preference -- in particular, look for security.tls.version.enable-deprecated

More info on about:config: Configuration Editor for Firefox.

Does that fix it -- meaning, you get the old error message again?

Matthew.Davis.2
Matthew.Davis.2 Biabia la
more options

Yep, `security.tls.version.enable-deprecated` was the setting that was changed. Now I've set that back to the default value of false, and the TLS warnings return.

Thanks!