alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY TLSv1.1 Used in Session"; flow:established,to_server; tls.version:1.1; reference:url,github.com/nsacyber/Mitigating-Obsolete-TLS; classtype:misc-activity; sid:2031490; rev:2; metadata:created_at 2021_01_06, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_03;)