How is BigFix secure? Authentication or Protocol used in BigFix for Secure communitation

I tried to run nmap to see what TLS was being accepted but it was a series of rejections (400s). I wonder how one can see what TLS Bigfix is accepting?

You can use openssl for that:

openssl  s_client -connect relay_hostname:port -tls1
openssl  s_client -connect relay_hostname:port -tls1_1
openssl  s_client -connect relay_hostname:port -tls1_2
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