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Find the SSL/TLS version clients are negotiate with your SSL server. Adapt the "src port 443" part as per your requirements. Uses tshark from https://www.wireshark.org
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| tshark -f 'src port 443 and ether[0x42]=0x16 and ether[0x47]=0x02' -T fields -e ip.dst_host -e ssl.handshake.version |
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The SSL/TLS version will be written as hex. 0x303 is TLS 1.2, 0x302 is TLS 1.1, 0x301 is TLS 1.0, 0x300 is SSL 3.0