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In Firefox 38.5, how do I ensure it will only use tls 1.2 and not fallback to lower versions or ssl?

Firefox Privacy and security
mmarino replied
mmarino
mmarino

I'm using Firefox 38.5 on CentOS 5.6. My current settings in about:config are as follows: security.tls.version.fallback-limit = 3 security.tls.version.max = 3 security.tls.version.min = 1

Are these settings already correct to only allow tls 1.2 or do I need to change the min value to 3 as well?

I'm using Firefox 38.5 on CentOS 5.6. My current settings in about:config are as follows: security.tls.version.fallback-limit = 3 security.tls.version.max = 3 security.tls.version.min = 1 Are these settings already correct to only allow tls 1.2 or do I need to change the min value to 3 as well?

All Replies (2)

cor-el
cor-el
  • Top 25 Contributor
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Chosen Solution

You would have to set security.tls.version.min = 3 if you really only want to enable TLS 1.2 Note that this will break servers that do not support TLS 1.2

0 means SSL 3.0, 1 means TLS 1.0, 2 means TLS 1.1, 3 means TLS 1.2 etc.

Modified by cor-el

mmarino
mmarino Question owner

Thanks - excellent answer.