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

[Suhitha]

Applicable to:

• Plesk for Linux
• Plesk for Windows

Question

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


Answer

1.Open the https://www.cdn77.com/tls-test link.

2.Enter the domain name, into the search bar and press the Test now button:



3.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


1.Log into the server via SSH.

2.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