Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

Wannan tattunawa ta zama daɗaɗɗiya. Yi sabuwar tambaya idan ka na bukatar taimako.

Browser still uses TLS_AES_128_GCM_SHA256 (0x1301) 128-bit SSL encryption cipher even when disabled in about:config

  • 1 amsa
  • 1 yana da wannan matsala
  • 1 view
  • Amsa ta ƙarshe daga cor-el

user1555634
user1555634
more options

Even after disabling all the 128-bit cipher suites in about:config, the cipher TLS_AES_128_GCM_SHA256 (0x1301) is still being used.

I used Qualys SSL Labs Client Test (https://www.ssllabs.com/ssltest/viewMyClient.html), and saw that TLS_AES_128_GCM_SHA256 (0x1301) remains to be the most preferred cipher suite.

All TLS 1.3 connections, such as facebook.com and cloudflare.com, uses that particular AES-128 cipher suite.

Is this a feature or a bug?

Even after disabling all the 128-bit cipher suites in about:config, the cipher TLS_AES_128_GCM_SHA256 (0x1301) is still being used. I used Qualys SSL Labs Client Test (https://www.ssllabs.com/ssltest/viewMyClient.html), and saw that TLS_AES_128_GCM_SHA256 (0x1301) remains to be the most preferred cipher suite. All TLS 1.3 connections, such as facebook.com and cloudflare.com, uses that particular AES-128 cipher suite. Is this a feature or a bug?

Mafitar da aka zaɓa

See:

  • Bug 1490902 - TLS 1.3 Adds & Prioritizes 3 Cipher Suites with inferior security to TLS 1.2 Suites

(please do not comment in bug reports
https://bugzilla.mozilla.org/page.cgi?id=etiquette.html)

Karanta wannan amsa a matsayinta 👍 1

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

Zaɓi Mafita

See:

  • Bug 1490902 - TLS 1.3 Adds & Prioritizes 3 Cipher Suites with inferior security to TLS 1.2 Suites

(please do not comment in bug reports
https://bugzilla.mozilla.org/page.cgi?id=etiquette.html)