alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY Proxy Connection detected"; flow:established,to_server; http.header_names; content:"|0d 0a|Proxy-Connection|0d 0a|"; classtype:attempted-user; sid:2001449; rev:9; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_19;)