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How to Check for SSL Renegotiation | To check if a server allows SSL Renegotiation, you can use the openssl command. I’ll show you how! The commands are as follows: $ openssl s_client -connect yourdomain.com:443 Then after the regular ssl cert info displays, enter the following: GET / HTTP/1.0 R If the server allows renegotiation, it will then have something similar to