You are here because you got info as above while testing your SSL/TLS. There are different ways of solutions depending on what are you using (Nginx, Apache etc.), but there is also one website for this.
1) Open SSL config generator by Mozilla and choose the appropriate options. Click the "link" and wait for the refresh.
2) Mozilla will generate the proper config. In this case, you will have to copy only the line as on the image below:
3) Paste the code into the config file (in sites-available). Test it before restarting the server, for example (Nginx):
nginx -t
4) If the test was successful restart the server (command below for Nginx):
service nginx restart
Enjoy:)
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