alert tls $HOME_NET any -> $EXTERNAL_NET 853 (msg:"ET INFO DNS Over TLS Request Outbound"; flow:established,to_server; ssl_state:client_hello|server_hello|client_keyx|server_keyx; reference:url,www.linuxbabe.com/ubuntu/ubuntu-stubby-dns-over-tls; classtype:not-suspicious; sid:2026774; rev:4; metadata:created_at 2019_01_10, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_24;)