The screen shot is from Firefox version 54 Windows, the error message on OS X is the same. I consider this a trap because it resets Firefox to again accept the older, less secure TLS versions (1.0 and 1.1). Do you want the default settings to be restored?" along with the blue "Restore default settings" button. Specifically, the note that "It looks like your network security settings might be causing this. įinally, the bottom of the message is a trap. And, annoyingly, the message does not say what unsupported version it encountered. There are three problems, however, with this Firefox error message.įor one thing, TLS 1.0 and 1.1, which the website is using, is indeed supported by Firefox-its just that a particular instance of the browser was configured not to use them. The security protocol it refers to is TLS.
Error code: SSL_ERROR_UNSUPPORTED_VERSION Peer using unsupported version of security protocol. An error occurred during a connection to. The error message from Firefox 54 when a website does not support TLS 1.2 and it only supports TLS 1.2įor the benefit of search engines, the error reads Secure Connection Failed. Last time, I discussed tweaking Firefox so that it only supports TLS version 1.2 and not the older versions (1.0 and 1.1) of the protocol.īut that begs the question: What happens when a security-reinforced copy of Firefox encounters a website that does not support TLS 1.2? The answer is shown below. There are multiple versions of the TLS protocol, and the most recent version, 1.2, is the most secure. TLS is the protocol invoked under the covers when viewing secure websites (those loaded with HTTPS rather than HTTP).
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