(SSL) Forces curl to use TLS version 1.2 when negotiating with a remote TLS server. You can use options -tlsv1.0, -tlsv1.1, and -tlsv1.2 to control the TLS version more precisely (if the SSL backend in use supports such a level of control). (SSL) Forces curl to use TLS version 1.x when negotiating with a remote TLS server. Since version 7.34.0, Curl has options -tlsv1.0, -tlsv1.1 and -tlsv1.2 for this purpose. openssl sclient can also use client certificate. Version 7.52.0 introduced -tlsv1.3 in addition to the other options listed below. TLS 1.2), each fixing design flaws in the previous version or adding features. For TLS 1.2: openssl sclient -connect -tls12 For TLS 1.1: openssl sclient -connect -tls11 For TLS 1: openssl sclient -connect -tls1 If you get the certificate chain and the handshake then the TLS version is supported. To specify an exact version to be used you likely have to also specify a value for -tls-max curl -tlsv1.2 -tls-max 1.2. Options like -tlsv1.2 now specify a minimum version that is to be used, they no longer specify the exact version to be used.

Since version 7.54.0 the behaviour has changed, see nelsonda's answer. There have been several relevant changes in Curl since the original question was asked.

At the date of the last revision to this answer, if you want to specify that TLS 1.2 is used but not 1.1 or 1.3 etc, you need something like curl -tlsv1.2 -tls-max 1.2. Look for the Technical details section. This will describe the version of TLS or SSL used.Curl has options to control the TLS version used.In the address bar, click the icon to the left of the URL.This will describe the version of TLS or SSL used. Select More tools > Developer tools > Security.Contents 1 Security 1.1 POODLE : SSLv3 harmful 1.2 versions tricks 1.2. Those protocols are configurable and can use various ciphers depending on their version. Connection-less support is provided via DTLS. Click on the ellipsis located on the top-right in the browser. The latest standard version is TLSv1.2 while the upcoming TLS v1.3 is still in the draft stage.

This will describe the version of TLS or SSL used.

In the new window, look for the Connection section.

Right-click the page or select the Page drop-down menu, and select Properties.

Enter the URL you wish to check in the browser.

How to find the Cipher in Internet Explorer Using a browser to open an HTTPS page and check the certificate properties to find the type of Cipher used to encrypt the connection.

Openssl test tls 1.2 with cert