How to check what SSL/TLS versions are available for a website on a Plesk server?

Dmitry Bystrov

10 months ago

Question

How to check what SSL/TLS versions are available for a website on a Plesk server?

Answer

Open the https://www.cdn77.com/tls-test link.
Enter the domain name, into the search bar and press the Test now button:
In the next page see the Enabled SSL/TLS protocol versions section:

Note: the more online services with SSL/TLS or vulnerability checkers can be found here.

Manually from the side of Linux server

Log into the server via SSH.
Execute the command:
# for proto in 1 1_1 1_2 1_3; do openssl s_client -connect example.com:443 "-tls${proto}" 2>/dev/null < <(sleep 1; echo q) | grep Protocol | uniq; done

Note: replace the example.com with the name of the required domain.

The output will be as shown below:

# Protocol : TLSv1
Protocol : TLSv1.1
Protocol : TLSv1.2
Protocol : TLSv1.3

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