The error in Chrome: A secured connection cannot be established because this site uses an unsupported protocol. Error code: ERRSSLVERSIONORCIPHERMISMATCH. The error in Firefox: Firefox cannot guarantee the safety of your data on. The error code is SSLERRORUNSUPPORTEDVERSION. Firefox users may override the limitation in the following way currently but that option will likely go away once the change lands in Firefox Stable in early 2020. Load about:config in the web browser's address bar. Data set mosfet k10a60d. Confirm that you will be careful. Error code: SSLERRORUNSUPPORTEDVERSION The security protocol it refers to is TLS. There are three problems, however, with this Firefox error message. For one thing, TLS 1.0 and 1.1, which the. I siti web che non supportano la versione TLS 1.2 o successiva visualizzeranno una pagina di errore 'Connessione sicura non riuscita' con il codice di errore: SSLERRORUNSUPPORTEDVERSION e un messaggio 'Questo sito web non supporta il protocollo TLS 1.2, la versione minima utilizzata da Firefox'. After apply the security update RHSA-2014:1919, Firefox may issue an error message such as the attached one when connecting to certain sites, stating that there are “no common encryption algorithm (s)”, giving the “ sslerrornocypheroverlap ” error code.
Sometime this March, the Firefox, Chrome, Safari and Edge browsers will start throwing up warnings when users visit websites that only support Transport Layer Security (TLS) versions 1.0 or 1.1.
Announced in October 2018 as part of a joint plan to phase out support, the implications for any holdout sites are stark – enable the later TLS 1.2 or, ideally, 1.3, or face having no traffic.
According to the latest Mozilla reminder, visitors using Firefox will start seeing a ‘Secure Connection Failed’ message with accompanying SSL_ERROR_UNSUPPORTED_VERSION for anyone in doubt.
Initially, it will be possible to override this but only for so long. Sooner rather than later, Mozilla says that too will disappear:
![Ssl_error_unsupported_version Firefox Ssl_error_unsupported_version Firefox](/uploads/1/1/8/2/118262919/175004781.png)
We’re committed to completely eradicating weak versions of TLS because at Mozilla we believe that user security should not be treated as optional.
Other browsers will follow suit, with the Chrome browser having adopted ‘Your connection to this site is not fully secure’ messages last month with full blocking due to begin in March.
Netscape Navigator
But why the need to ditch TLS 1.0 and 1.1?
![Ssl_error_unsupported_version Ssl_error_unsupported_version](/uploads/1/1/8/2/118262919/754469543.gif)
Although not exactly a household name, TLS is the encryption protocol that makes several types of secure connection possible, including secure versions of SMTP, POP3, FTP and of, course, HTTP.
For example, when a browser visits a site using HTTPS, TLS sets up authentication, the exchange of session keys, and agreement on cipher suites.
Firefox Tls 1.2
To make all this work, both ends must also agree which version of TLS they will use, which is where the problems start for older versions. Office 2011 high sierra.
Issue number one is the age of TLS 1.0 and 1.1.
As far as the IETF is concerned, TLS 1.0 has been around since 1999, building on technology invented years before that to work with Netscape’s famous but ancient Navigator browser.
TLS 1.1 arrived in 2006 but was quickly improved upon by TLS 1.2 two years later. We’re now up to TLS 1.3, support for which is appearing now.
Going from TLS 1.0 to 1.3 might not sound like a huge jump but TLS 1.3 is vastly more secure and more optimised for the speed of today’s internet – both valid reasons to ask sites to get rid of older versions.
It’s not clear how many sites still use TLS 1.0 and 1.1 – Google estimates around 0.75% of page loads – but even a small sliver of sites is now too many.
Firefox Errore Ssl_error_unsupported_version
Judging from the sites cited by Google, most appear to be smaller domains which are either unmanaged or managed passively.
From March, for the want of an upgrade, these sites will start to suffer the consequences of that.
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Although controversial, Firefox 3’s secure connection failed warning, shown when a website’s digital certificate is invalid or self-signed, can be easily disabled.
- In the address bar, type about:config > click ‘Enter’.
- You’ll get a warning message, This might void your warranty!, click I’ll be careful, I promise!
- Double-click browser.ssl_override_behavior and change the value from ‘1’ to ‘2’.
- Restart Firefox.
Instead of disabling the notice all together, you can have a warning displayed – without having to add an exception.
- browser.xul.error_pages.expert_bad_cert = true
Firefox’s anti-phishing warnings will still warn users if a specific site is suspicious. I’m not convinced that the secure connection failed warning really helps the average user, since they won’t know what it is. Either way, you can now get around it.
Each Tuesday, Security Musings features a topic to help educate our readers about security. For more information about Gemini Security Solutions’ security education capabilities, contact us!