What is TLS 1.2?
TLS 1.2 is the newest and most secure version of the TLS protocol. TLS is the protocol that encrypts communication between users and your website. When web traffic is encrypted with TLS, users will see the green padlock in their browser window.
What does TLS 1.2 Only do?
By turning on the TLS 1.2 Only feature, traffic to and from your website will only be served over the TLS 1.2 protocol.
In order to comply with PCI 3.1, your web traffic must be served only over TLS 1.2.
Note: Older browsers do not support TLS 1.2. Turning on this feature may restrict users with older browsers from accessing your website.