How to manage SSL/TLS ciphers and protocols in Plesk for Windows?
For example, disable insecure ciphers and enable more recent ones.
Note: Plesk doesn not provide build-in functionality to manage SSL/TLS ciphers on Windows server. Use Windows utilities or 3rd-party applications instead.
Using Windows utilities
Connect to the server via RDP.
Go to Start > Edit group policy.
Go to Local Computer Policy > Computer Configuration > Administrative Template > Network > SSL Configuration Settings > SSL Cipher Suite Order.
Set option Enabled.
Edit SSL Cipher Suites in the line.
Press OK to apply changes.